richard@MacBook-Pro:~/vector/riot-web$npm run start

> riot-web@0.12.1 start /Users/richard/vector/riot-web
> parallelshell "npm run reskindex:watch" "npm run start:res" "npm run start:js"

child_process.js:400
    throw new TypeError('"cwd" must be a string');
    ^

TypeError: "cwd" must be a string
    at normalizeSpawnArguments (child_process.js:400:11)
    at exports.spawn (child_process.js:487:38)
    at /Users/richard/vector/riot-web/node_modules/parallelshell/index.js:92:17
    at Array.forEach (<anonymous>)
    at Object.<anonymous> (/Users/richard/vector/riot-web/node_modules/parallelshell/index.js:91:6)
    at Module._compile (module.js:573:30)
    at Object.Module._extensions..js (module.js:584:10)
    at Module.load (module.js:507:32)
    at tryModuleLoad (module.js:470:12)
    at Function.Module._load (module.js:462:3)
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! riot-web@0.12.1 start: `parallelshell "npm run reskindex:watch" "npm run start:res" "npm run start:js"`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the riot-web@0.12.1 start script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:
npm ERR!     /Users/richard/.npm/_logs/2017-08-24T11_07_22_099Z-debug.log