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ModuleNotFoundError: No module named 'dataclasses' #16119

Closed
Closed
ModuleNotFoundError: No module named 'dataclasses'#16119
Assignees
karthiknadig
Labels
area-intellisenseLSP-related functionality: auto-complete, docstrings, navigation, refactoring, etc.bugIssue identified by VS Code Team member as probable bugimportantIssue identified as high-priority

Description

@rohel01
rohel01
opened on May 4, 2021

Environment data

  • VS Code version: 1.54.1
  • Extension version (available under the Extensions sidebar): v2021.4.765268190
  • OS and version: Ubuntu 18.04.5
  • Python version (& distribution if applicable, e.g. Anaconda): Python 3.6.9
  • Type of virtual environment used (N/A | venv | virtualenv | conda | ...): N/A
  • Relevant/affected Python packages and their versions: N/A
  • Relevant/affected Python-related VS Code extensions and their versions: N/A
  • Value of the python.languageServer setting: Jedi

Expected behaviour

Working Python language server

Actual behaviour

As soon as vscode is started, the output window for the Python language server opens with content detailed below:

Steps to reproduce:

[NOTE: Self-contained, minimal reproducing code samples are extremely helpful and will expedite addressing your issue]

  1. Open vscode on a directory containing a python module

Please note I am working behind a corporate firewall, with no access to PyPI or similar. I am using the distribution default python installation.

Logs

Output for Python in the Output panel (View→Output, change the drop-down the upper-right of the Output panel to Python) 

User belongs to experiment group 'pythonaa'
User belongs to experiment group 'pythonJediLSP'
User belongs to experiment group 'pythonDiscoveryModuleWithoutWatcher'
User belongs to experiment group 'pythonTensorboardExperiment'
User belongs to experiment group 'PythonPyTorchProfiler'
User belongs to experiment group 'ShowExtensionSurveyPrompt - enabled'
User belongs to experiment group 'CollectLSRequestTiming - control'
User belongs to experiment group 'DeprecatePythonPath - experiment'
> python ~/.vscode/extensions/ms-python.python-2021.4.765268190/pythonFiles/pyvsc-run-isolated.py -c "import sys;print(sys.executable)"
> python ~/.vscode/extensions/ms-python.python-2021.4.765268190/pythonFiles/pyvsc-run-isolated.py -c "import sys;print(sys.executable)"
> python ~/.vscode/extensions/ms-python.python-2021.4.765268190/pythonFiles/pyvsc-run-isolated.py -c "import sys;print(sys.executable)"
> python ~/.vscode/extensions/ms-python.python-2021.4.765268190/pythonFiles/pyvsc-run-isolated.py -c "import sys;print(sys.executable)"
Error 2021-05-04 09:26:05: Failed to check if file needs to be fixed [EntryNotFound (FileSystemError): Unable to read file '/home/melchiore/src/tools/rectipy/.vscode/settings.json' (Error: Unable to resolve non-existing file '/home/melchiore/src/tools/rectipy/.vscode/settings.json')
	at _handleError (/usr/share/code/resources/app/out/vs/workbench/services/extensions/node/extensionHostProcess.js:87:151863)
	at processTicksAndRejections (internal/process/task_queues.js:97:5)
	at async y.readText (/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/out/client/extension.js:9:339523)
	at async p.doesFileNeedToBeFixed (/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/out/client/extension.js:59:577126)
	at async /home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/out/client/extension.js:59:576253
	at async Promise.all (index 1)
	at async p.getFilesToBeFixed (/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/out/client/extension.js:59:576199)
	at async p.updateTestSettings (/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/out/client/extension.js:59:575826)] {
  code: 'FileNotFound'
}
Python interpreter path: /usr/bin/python3
Starting Jedi language server.
Error 2021-05-04 09:26:05: Failed to start language server, Class name = r, completed in 791ms, has a falsy return value, Arg 1: <Uri:/home/melchiore/src/tools/rectipy/src/rectipy.py>, Arg 2: {"sysPrefix":"/usr","envType":"Unknown","envName":"","envPath":"","path":"/usr/bin/python3","architecture":3,"sysVersion":"3.6.9 (default, Jan 26 2021, 15:33:00) \n[GCC 8.4.0]","version":{"raw":"3.6.9","major":3,"minor":6,"patch":9,"build":[],"prerelease":["final","0"]},"displayName":"Python 3.6.9 64-bit"}, Arg 3: <argument cannot be serialized for logging>, Return Value: undefined [Error: Connection to server got closed. Server will not be restarted.
	at E.handleConnectionClosed (/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/out/client/extension.js:9:179488)
	at E.handleConnectionClosed (/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/out/client/extension.js:59:21817)
	at t (/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/out/client/extension.js:9:177267)
	at invoke (/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/out/client/extension.js:9:318776)
	at o.fire (/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/out/client/extension.js:9:319537)
	at X (/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/out/client/extension.js:59:57486)
	at invoke (/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/out/client/extension.js:9:318776)
	at o.fire (/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/out/client/extension.js:9:319537)
	at g.fireClose (/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/out/client/extension.js:59:47555)
	at Socket.<anonymous> (/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/out/client/extension.js:59:49135)
	at Socket.emit (events.js:327:22)
	at Pipe.<anonymous> (net.js:674:12)]
Error 2021-05-04 09:26:05: Starting language server, Class name = r, completed in 792ms, has a falsy return value, , Return Value: undefined [Error: Connection to server got closed. Server will not be restarted.
	at E.handleConnectionClosed (/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/out/client/extension.js:9:179488)
	at E.handleConnectionClosed (/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/out/client/extension.js:59:21817)
	at t (/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/out/client/extension.js:9:177267)
	at invoke (/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/out/client/extension.js:9:318776)
	at o.fire (/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/out/client/extension.js:9:319537)
	at X (/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/out/client/extension.js:59:57486)
	at invoke (/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/out/client/extension.js:9:318776)
	at o.fire (/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/out/client/extension.js:9:319537)
	at g.fireClose (/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/out/client/extension.js:59:47555)
	at Socket.<anonymous> (/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/out/client/extension.js:59:49135)
	at Socket.emit (events.js:327:22)
	at Pipe.<anonymous> (net.js:674:12)]
Error 2021-05-04 09:26:05: Failed to start language server, Class name = r, completed in 794ms, has a falsy return value, Arg 1: <Uri:/home/melchiore/src/tools/rectipy/src/rectipy.py>, Arg 2: {"sysPrefix":"/usr","envType":"Unknown","envName":"","envPath":"","path":"/usr/bin/python3","architecture":3,"sysVersion":"3.6.9 (default, Jan 26 2021, 15:33:00) \n[GCC 8.4.0]","version":{"raw":"3.6.9","major":3,"minor":6,"patch":9,"build":[],"prerelease":["final","0"]},"displayName":"Python 3.6.9 64-bit"}, Return Value: undefined [Error: Connection to server got closed. Server will not be restarted.
	at E.handleConnectionClosed (/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/out/client/extension.js:9:179488)
	at E.handleConnectionClosed (/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/out/client/extension.js:59:21817)
	at t (/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/out/client/extension.js:9:177267)
	at invoke (/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/out/client/extension.js:9:318776)
	at o.fire (/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/out/client/extension.js:9:319537)
	at X (/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/out/client/extension.js:59:57486)
	at invoke (/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/out/client/extension.js:9:318776)
	at o.fire (/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/out/client/extension.js:9:319537)
	at g.fireClose (/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/out/client/extension.js:59:47555)
	at Socket.<anonymous> (/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/out/client/extension.js:59:49135)
	at Socket.emit (events.js:327:22)
	at Pipe.<anonymous> (net.js:674:12)]
Error 2021-05-04 09:26:05: [Error: Connection to server got closed. Server will not be restarted.
	at E.handleConnectionClosed (/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/out/client/extension.js:9:179488)
	at E.handleConnectionClosed (/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/out/client/extension.js:59:21817)
	at t (/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/out/client/extension.js:9:177267)
	at invoke (/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/out/client/extension.js:9:318776)
	at o.fire (/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/out/client/extension.js:9:319537)
	at X (/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/out/client/extension.js:59:57486)
	at invoke (/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/out/client/extension.js:9:318776)
	at o.fire (/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/out/client/extension.js:9:319537)
	at g.fireClose (/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/out/client/extension.js:59:47555)
	at Socket.<anonymous> (/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/out/client/extension.js:59:49135)
	at Socket.emit (events.js:327:22)
	at Pipe.<anonymous> (net.js:674:12)]
We encountered an issue starting the language server. Reverting to Jedi language engine. Check the Python output panel for details.
Error 2021-05-04 09:26:05: Failed to activate language server, Class name = a, completed in 796ms, has a falsy return value, Arg 1: <Uri:/home/melchiore/src/tools/rectipy/src/rectipy.py>, Arg 2: {"sysPrefix":"/usr","envType":"Unknown","envName":"","envPath":"","path":"/usr/bin/python3","architecture":3,"sysVersion":"3.6.9 (default, Jan 26 2021, 15:33:00) \n[GCC 8.4.0]","version":{"raw":"3.6.9","major":3,"minor":6,"patch":9,"build":[],"prerelease":["final","0"]},"displayName":"Python 3.6.9 64-bit"}, Return Value: undefined [Error: Connection to server got closed. Server will not be restarted.
	at E.handleConnectionClosed (/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/out/client/extension.js:9:179488)
	at E.handleConnectionClosed (/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/out/client/extension.js:59:21817)
	at t (/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/out/client/extension.js:9:177267)
	at invoke (/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/out/client/extension.js:9:318776)
	at o.fire (/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/out/client/extension.js:9:319537)
	at X (/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/out/client/extension.js:59:57486)
	at invoke (/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/out/client/extension.js:9:318776)
	at o.fire (/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/out/client/extension.js:9:319537)
	at g.fireClose (/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/out/client/extension.js:59:47555)
	at Socket.<anonymous> (/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/out/client/extension.js:59:49135)
	at Socket.emit (events.js:327:22)
	at Pipe.<anonymous> (net.js:674:12)]
> conda --version
> /usr/bin/python3 ~/.vscode/extensions/ms-python.python-2021.4.765268190/pythonFiles/pyvsc-run-isolated.py -c "import sys;print(sys.prefix)"
cwd: ~/src/tools/rectipy
> /usr/bin/python3 ~/.vscode/extensions/ms-python.python-2021.4.765268190/pythonFiles/pyvsc-run-isolated.py -c "import sys;print(sys.prefix)"
cwd: ~/src/tools/rectipy
> /usr/bin/python3 ~/.vscode/extensions/ms-python.python-2021.4.765268190/pythonFiles/pyvsc-run-isolated.py -c "import sys;print(sys.executable)"
cwd: ~/src/tools/rectipy
> /usr/bin/python3 ~/.vscode/extensions/ms-python.python-2021.4.765268190/pythonFiles/pyvsc-run-isolated.py -c "import sys;print(sys.executable)"
cwd: ~/src/tools/rectipy
> /usr/bin/python3 ~/.vscode/extensions/ms-python.python-2021.4.765268190/pythonFiles/pyvsc-run-isolated.py -c "from distutils.sysconfig import get_python_lib; print(get_python_lib())"
cwd: ~/src/tools/rectipy
> /usr/bin/python3 ~/.vscode/extensions/ms-python.python-2021.4.765268190/pythonFiles/pyvsc-run-isolated.py -c "from distutils.sysconfig import get_python_lib; print(get_python_lib())"
cwd: ~/src/tools/rectipy
> /usr/bin/python3 ~/.vscode/extensions/ms-python.python-2021.4.765268190/pythonFiles/pyvsc-run-isolated.py site --user-site
cwd: ~/src/tools/rectipy
> /usr/bin/python3 ~/.vscode/extensions/ms-python.python-2021.4.765268190/pythonFiles/pyvsc-run-isolated.py site --user-site
cwd: ~/src/tools/rectipy
> /usr/bin/python3 ~/.vscode/extensions/ms-python.python-2021.4.765268190/pythonFiles/pyvsc-run-isolated.py ~/.vscode/extensions/ms-python.python-2021.4.765268190/pythonFiles/completion.py
> /usr/bin/python3 ~/.vscode/extensions/ms-python.python-2021.4.765268190/pythonFiles/pyvsc-run-isolated.py ~/.vscode/extensions/ms-python.python-2021.4.765268190/pythonFiles/completion.py

Output for Python Language Server in the Output panel (View→Output, change the drop-down the upper-right of the Output panel to Python Language Server) 

Traceback (most recent call last):
  File "/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/pythonFiles/run-jedi-language-server.py", line 9, in <module>
    from jedi_language_server.cli import cli
  File "/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/pythonFiles/lib/jedilsp/jedi_language_server/cli.py", line 7, in <module>
    from .server import SERVER
  File "/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/pythonFiles/lib/jedilsp/jedi_language_server/server.py", line 15, in <module>
    from pygls.lsp.methods import (
  File "/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/pythonFiles/lib/jedilsp/pygls/lsp/__init__.py", line 21, in <module>
    from pygls.lsp.types import *
  File "/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/pythonFiles/lib/jedilsp/pygls/lsp/types/__init__.py", line 2, in <module>
    from pygls.lsp.types.basic_structures import *
  File "/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/pythonFiles/lib/jedilsp/pygls/lsp/types/basic_structures.py", line 53, in <module>
    class JsonRpcMessage(Model):
  File "/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/pythonFiles/lib/jedilsp/pydantic/main.py", line 298, in __new__
    config=config,
  File "/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/pythonFiles/lib/jedilsp/pydantic/fields.py", line 419, in infer
    field_info=field_info,
  File "/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/pythonFiles/lib/jedilsp/pydantic/fields.py", line 342, in __init__
    self.prepare()
  File "/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/pythonFiles/lib/jedilsp/pydantic/fields.py", line 456, in prepare
    self.populate_validators()
  File "/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/pythonFiles/lib/jedilsp/pydantic/fields.py", line 670, in populate_validators
    *(get_validators() if get_validators else list(find_validators(self.type_, self.model_config))),
  File "/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/pythonFiles/lib/jedilsp/pydantic/validators.py", line 674, in find_validators
    if is_builtin_dataclass(type_):
  File "/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/pythonFiles/lib/jedilsp/pydantic/dataclasses.py", line 79, in is_builtin_dataclass
    import dataclasses
ModuleNotFoundError: No module named 'dataclasses'
[Info  - 9:26:05 AM] Connection to server got closed. Server will restart.
Traceback (most recent call last):
  File "/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/pythonFiles/run-jedi-language-server.py", line 9, in <module>
    from jedi_language_server.cli import cli
  File "/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/pythonFiles/lib/jedilsp/jedi_language_server/cli.py", line 7, in <module>
    from .server import SERVER
  File "/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/pythonFiles/lib/jedilsp/jedi_language_server/server.py", line 15, in <module>
    from pygls.lsp.methods import (
  File "/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/pythonFiles/lib/jedilsp/pygls/lsp/__init__.py", line 21, in <module>
    from pygls.lsp.types import *
  File "/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/pythonFiles/lib/jedilsp/pygls/lsp/types/__init__.py", line 2, in <module>
    from pygls.lsp.types.basic_structures import *
  File "/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/pythonFiles/lib/jedilsp/pygls/lsp/types/basic_structures.py", line 53, in <module>
    class JsonRpcMessage(Model):
  File "/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/pythonFiles/lib/jedilsp/pydantic/main.py", line 298, in __new__
    config=config,
  File "/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/pythonFiles/lib/jedilsp/pydantic/fields.py", line 419, in infer
    field_info=field_info,
  File "/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/pythonFiles/lib/jedilsp/pydantic/fields.py", line 342, in __init__
    self.prepare()
  File "/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/pythonFiles/lib/jedilsp/pydantic/fields.py", line 456, in prepare
    self.populate_validators()
  File "/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/pythonFiles/lib/jedilsp/pydantic/fields.py", line 670, in populate_validators
    *(get_validators() if get_validators else list(find_validators(self.type_, self.model_config))),
  File "/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/pythonFiles/lib/jedilsp/pydantic/validators.py", line 674, in find_validators
    if is_builtin_dataclass(type_):
  File "/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/pythonFiles/lib/jedilsp/pydantic/dataclasses.py", line 79, in is_builtin_dataclass
    import dataclasses
ModuleNotFoundError: No module named 'dataclasses'
[Info  - 9:26:05 AM] Connection to server got closed. Server will restart.
Traceback (most recent call last):
  File "/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/pythonFiles/run-jedi-language-server.py", line 9, in <module>
    from jedi_language_server.cli import cli
  File "/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/pythonFiles/lib/jedilsp/jedi_language_server/cli.py", line 7, in <module>
    from .server import SERVER
  File "/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/pythonFiles/lib/jedilsp/jedi_language_server/server.py", line 15, in <module>
    from pygls.lsp.methods import (
  File "/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/pythonFiles/lib/jedilsp/pygls/lsp/__init__.py", line 21, in <module>
    from pygls.lsp.types import *
  File "/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/pythonFiles/lib/jedilsp/pygls/lsp/types/__init__.py", line 2, in <module>
    from pygls.lsp.types.basic_structures import *
  File "/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/pythonFiles/lib/jedilsp/pygls/lsp/types/basic_structures.py", line 53, in <module>
    class JsonRpcMessage(Model):
  File "/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/pythonFiles/lib/jedilsp/pydantic/main.py", line 298, in __new__
    config=config,
  File "/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/pythonFiles/lib/jedilsp/pydantic/fields.py", line 419, in infer
    field_info=field_info,
  File "/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/pythonFiles/lib/jedilsp/pydantic/fields.py", line 342, in __init__
    self.prepare()
  File "/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/pythonFiles/lib/jedilsp/pydantic/fields.py", line 456, in prepare
    self.populate_validators()
  File "/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/pythonFiles/lib/jedilsp/pydantic/fields.py", line 670, in populate_validators
    *(get_validators() if get_validators else list(find_validators(self.type_, self.model_config))),
  File "/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/pythonFiles/lib/jedilsp/pydantic/validators.py", line 674, in find_validators
    if is_builtin_dataclass(type_):
  File "/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/pythonFiles/lib/jedilsp/pydantic/dataclasses.py", line 79, in is_builtin_dataclass
    import dataclasses
ModuleNotFoundError: No module named 'dataclasses'
[Info  - 9:26:05 AM] Connection to server got closed. Server will restart.
Traceback (most recent call last):
  File "/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/pythonFiles/run-jedi-language-server.py", line 9, in <module>
    from jedi_language_server.cli import cli
  File "/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/pythonFiles/lib/jedilsp/jedi_language_server/cli.py", line 7, in <module>
    from .server import SERVER
  File "/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/pythonFiles/lib/jedilsp/jedi_language_server/server.py", line 15, in <module>
    from pygls.lsp.methods import (
  File "/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/pythonFiles/lib/jedilsp/pygls/lsp/__init__.py", line 21, in <module>
    from pygls.lsp.types import *
  File "/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/pythonFiles/lib/jedilsp/pygls/lsp/types/__init__.py", line 2, in <module>
    from pygls.lsp.types.basic_structures import *
  File "/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/pythonFiles/lib/jedilsp/pygls/lsp/types/basic_structures.py", line 53, in <module>
    class JsonRpcMessage(Model):
  File "/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/pythonFiles/lib/jedilsp/pydantic/main.py", line 298, in __new__
    config=config,
  File "/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/pythonFiles/lib/jedilsp/pydantic/fields.py", line 419, in infer
    field_info=field_info,
  File "/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/pythonFiles/lib/jedilsp/pydantic/fields.py", line 342, in __init__
    self.prepare()
  File "/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/pythonFiles/lib/jedilsp/pydantic/fields.py", line 456, in prepare
    self.populate_validators()
  File "/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/pythonFiles/lib/jedilsp/pydantic/fields.py", line 670, in populate_validators
    *(get_validators() if get_validators else list(find_validators(self.type_, self.model_config))),
  File "/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/pythonFiles/lib/jedilsp/pydantic/validators.py", line 674, in find_validators
    if is_builtin_dataclass(type_):
  File "/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/pythonFiles/lib/jedilsp/pydantic/dataclasses.py", line 79, in is_builtin_dataclass
    import dataclasses
ModuleNotFoundError: No module named 'dataclasses'
[Info  - 9:26:05 AM] Connection to server got closed. Server will restart.
Traceback (most recent call last):
  File "/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/pythonFiles/run-jedi-language-server.py", line 9, in <module>
    from jedi_language_server.cli import cli
  File "/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/pythonFiles/lib/jedilsp/jedi_language_server/cli.py", line 7, in <module>
    from .server import SERVER
  File "/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/pythonFiles/lib/jedilsp/jedi_language_server/server.py", line 15, in <module>
    from pygls.lsp.methods import (
  File "/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/pythonFiles/lib/jedilsp/pygls/lsp/__init__.py", line 21, in <module>
    from pygls.lsp.types import *
  File "/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/pythonFiles/lib/jedilsp/pygls/lsp/types/__init__.py", line 2, in <module>
    from pygls.lsp.types.basic_structures import *
  File "/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/pythonFiles/lib/jedilsp/pygls/lsp/types/basic_structures.py", line 53, in <module>
    class JsonRpcMessage(Model):
  File "/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/pythonFiles/lib/jedilsp/pydantic/main.py", line 298, in __new__
    config=config,
  File "/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/pythonFiles/lib/jedilsp/pydantic/fields.py", line 419, in infer
    field_info=field_info,
  File "/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/pythonFiles/lib/jedilsp/pydantic/fields.py", line 342, in __init__
    self.prepare()
  File "/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/pythonFiles/lib/jedilsp/pydantic/fields.py", line 456, in prepare
    self.populate_validators()
  File "/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/pythonFiles/lib/jedilsp/pydantic/fields.py", line 670, in populate_validators
    *(get_validators() if get_validators else list(find_validators(self.type_, self.model_config))),
  File "/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/pythonFiles/lib/jedilsp/pydantic/validators.py", line 674, in find_validators
    if is_builtin_dataclass(type_):
  File "/home/melchiore/.vscode/extensions/ms-python.python-2021.4.765268190/pythonFiles/lib/jedilsp/pydantic/dataclasses.py", line 79, in is_builtin_dataclass
    import dataclasses
ModuleNotFoundError: No module named 'dataclasses'
[Error - 9:26:05 AM] Connection to server got closed. Server will not be restarted.

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area-intellisenseLSP-related functionality: auto-complete, docstrings, navigation, refactoring, etc.bugIssue identified by VS Code Team member as probable bugimportantIssue identified as high-priority

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