can't make a trade #128

I wrote the following code for trying to make a trade

from uniswap import Uniswap
from web3 import Web3

wallet_address = "xxx"
private_key = "yyyy"
address = Web3.toChecksumAddress(wallet_address)
version = 2  

bsc = "https://bsc-dataseed.binance.org/"
web3 = Web3(Web3.HTTPProvider(bsc))
print(web3.isConnected())
uniswap = Uniswap(address=address, private_key=private_key, version=version, web3=web3)

wbnb = "0xbb4CdB9CBd36B01bD1cBaEBF2De08d9173bc095c"
token = "0xa872960bc3393b2a19aa1e784ab7f385d543ce37"

wbnb_w = Web3.toChecksumAddress(wbnb)
token_w = Web3.toChecksumAddress(token)

qty = int(.05 * 10**18)

uniswap.make_trade(wbnb_w, token_w, qty)

but I got this output:

Approving 0xbb4CdB9CBd36B01bD1cBaEBF2De08d9173bc095c...
`---------------------------------------------------------------------------
Error Traceback (most recent call last)
in
----> 1 uniswap.make_trade(wbnb_w, token_w, qty)

~/virtualenv/generale/lib/python3.8/site-packages/uniswap/decorators.py in approved(self, *args, **kwargs)
27 # logger.warning(f"Approved? {token}: {is_approved}")
28 if not is_approved:
---> 29 self._approve(token)
30 if token_two:
31 is_approved = self._is_approved(token_two)

~/virtualenv/generale/lib/python3.8/site-packages/uniswap/uniswap.py in _approve(self, token, max_approval)
850 )
851 logger.warning(f"Approving {_addr_to_str(token)}...")
--> 852 tx = self._build_and_send_tx(function)
853 self.w3.eth.waitForTransactionReceipt(tx, timeout=6000)
854

~/virtualenv/generale/lib/python3.8/site-packages/uniswap/uniswap.py in _build_and_send_tx(self, function, tx_params)
885 tx_params = self._get_tx_params()
886 transaction = function.buildTransaction(tx_params)
--> 887 signed_txn = self.w3.eth.account.sign_transaction(
888 transaction, private_key=self.private_key
889 )

~/virtualenv/generale/lib/python3.8/site-packages/eth_utils/decorators.py in _wrapper(*args, **kwargs)
16 def _wrapper(*args: Any, **kwargs: Any) -> Any:
17 if obj is not None:
---> 18 return self.method(obj, *args, **kwargs)
19 else:
20 return self.method(objtype, *args, **kwargs)

~/virtualenv/generale/lib/python3.8/site-packages/eth_account/account.py in sign_transaction(self, transaction_dict, private_key)
645 raise TypeError("transaction_dict must be dict-like, got %r" % transaction_dict)
646
--> 647 account = self.from_key(private_key)
648
649 # allow from field, only if it matches the private key

~/virtualenv/generale/lib/python3.8/site-packages/eth_utils/decorators.py in _wrapper(*args, **kwargs)
16 def _wrapper(*args: Any, **kwargs: Any) -> Any:
17 if obj is not None:
---> 18 return self.method(obj, *args, **kwargs)
19 else:
20 return self.method(objtype, *args, **kwargs)

~/virtualenv/generale/lib/python3.8/site-packages/eth_account/account.py in from_key(self, private_key)
244 # but without the private key argument
245 """
--> 246 key = self._parsePrivateKey(private_key)
247 return LocalAccount(key, self)
248

~/virtualenv/generale/lib/python3.8/site-packages/eth_utils/decorators.py in _wrapper(*args, **kwargs)
16 def _wrapper(*args: Any, **kwargs: Any) -> Any:
17 if obj is not None:
---> 18 return self.method(obj, *args, **kwargs)
19 else:
20 return self.method(objtype, *args, **kwargs)

~/virtualenv/generale/lib/python3.8/site-packages/eth_account/account.py in _parsePrivateKey(self, key)
692
693 try:
--> 694 return self._keys.PrivateKey(HexBytes(key))
695 except ValidationError as original_exception:
696 raise ValueError(

~/virtualenv/generale/lib/python3.8/site-packages/hexbytes/main.py in new(cls, val)
21 """
22 def new(cls: Type[bytes], val: Union[bool, bytearray, bytes, int, str]) -> "HexBytes":
---> 23 bytesval = to_bytes(val)
24 return cast(HexBytes, super().new(cls, bytesval)) # type: ignore # python/typeshed#2630 # noqa: E501
25

~/virtualenv/generale/lib/python3.8/site-packages/hexbytes/_utils.py in to_bytes(val)
15 return val
16 elif isinstance(val, str):
---> 17 return hexstr_to_bytes(val)
18 elif isinstance(val, bytearray):
19 return bytes(val)

~/virtualenv/generale/lib/python3.8/site-packages/hexbytes/_utils.py in hexstr_to_bytes(hexstr)
48 raise ValueError(f"hex string {padded_hex} may only contain [0-9a-fA-F] characters")
49 else:
---> 50 return binascii.unhexlify(ascii_hex)

Error: Non-hexadecimal digit found`

I was trying to use pancakeswap (wbrb should have 18 decimals).