The "path" argument must be of type string.

[i001962]

git clone the repo, npm i, npm start
localhost:3000 starts but I see this...

TypeError [ERR_INVALID_ARG_TYPE]: The "path" argument must be of type string. Received undefined
at validateString (internal/validators.js:121:11)
at Object.join (path.js:1039:7)
at noopServiceWorkerMiddleware (/Users/kmm/Dropbox/aws/onegraph/authguardian-react-starter/node_modules/react-dev-utils/noopServiceWorkerMiddleware.js:14:26)
at Layer.handle [as handle_request] (/Users/kmm/Dropbox/aws/onegraph/authguardian-react-starter/node_modules/express/lib/router/layer.js:95:5)
at trim_prefix (/Users/kmm/Dropbox/aws/onegraph/authguardian-react-starter/node_modules/express/lib/router/index.js:317:13)
at /Users/kmm/Dropbox/aws/onegraph/authguardian-react-starter/node_modules/express/lib/router/index.js:284:7
at Function.process_params (/Users/kmm/Dropbox/aws/onegraph/authguardian-react-starter/node_modules/express/lib/router/index.js:335:12)
at next (/Users/kmm/Dropbox/aws/onegraph/authguardian-react-starter/node_modules/express/lib/router/index.js:275:10)
at launchEditorMiddleware (/Users/kmm/Dropbox/aws/onegraph/authguardian-react-starter/node_modules/react-dev-utils/errorOverlayMiddleware.js:20:7)
at Layer.handle [as handle_request] (/Users/kmm/Dropbox/aws/onegraph/authguardian-react-starter/node_modules/express/lib/router/layer.js:95:5)
at trim_prefix (/Users/kmm/Dropbox/aws/onegraph/authguardian-react-starter/node_modules/express/lib/router/index.js:317:13)
at /Users/kmm/Dropbox/aws/onegraph/authguardian-react-starter/node_modules/express/lib/router/index.js:284:7
at Function.process_params (/Users/kmm/Dropbox/aws/onegraph/authguardian-react-starter/node_modules/express/lib/router/index.js:335:12)
at next (/Users/kmm/Dropbox/aws/onegraph/authguardian-react-starter/node_modules/express/lib/router/index.js:275:10)
at handleWebpackInternalMiddleware (/Users/kmm/Dropbox/aws/onegraph/authguardian-react-starter/node_modules/react-dev-utils/evalSourceMapMiddleware.js:42:7)
at Layer.handle [as handle_request] (/Users/kmm/Dropbox/aws/onegraph/authguardian-react-starter/node_modules/express/lib/router/layer.js:95:5)