TypeError [ERR_INVALID_ARG_TYPE]: The "path" argument must be of type string. Received undefined
at validateString (internal/validators.js:124:11)
at Object.join (path.js:424:7)
at noopServiceWorkerMiddleware (C:\Swapnil\Dev\Learn\Reactjs\websocket-reactjs-master\node_modules\react-dev-utils\noopServiceWorkerMiddleware.js:14:26)
at Layer.handle [as handle_request] (C:\Swapnil\Dev\Learn\Reactjs\websocket-reactjs-master\node_modules\express\lib\router\layer.js:95:5)
at trim_prefix (C:\Swapnil\Dev\Learn\Reactjs\websocket-reactjs-master\node_modules\express\lib\router\index.js:317:13)
at C:\Swapnil\Dev\Learn\Reactjs\websocket-reactjs-master\node_modules\express\lib\router\index.js:284:7
at Function.process_params (C:\Swapnil\Dev\Learn\Reactjs\websocket-reactjs-master\node_modules\express\lib\router\index.js:335:12)
at next (C:\Swapnil\Dev\Learn\Reactjs\websocket-reactjs-master\node_modules\express\lib\router\index.js:275:10)
at launchEditorMiddleware (C:\Swapnil\Dev\Learn\Reactjs\websocket-reactjs-master\node_modules\react-dev-utils\errorOverlayMiddleware.js:20:7)
at Layer.handle [as handle_request] (C:\Swapnil\Dev\Learn\Reactjs\websocket-reactjs-master\node_modules\express\lib\router\layer.js:95:5)
at trim_prefix (C:\Swapnil\Dev\Learn\Reactjs\websocket-reactjs-master\node_modules\express\lib\router\index.js:317:13)
at C:\Swapnil\Dev\Learn\Reactjs\websocket-reactjs-master\node_modules\express\lib\router\index.js:284:7
at Function.process_params (C:\Swapnil\Dev\Learn\Reactjs\websocket-reactjs-master\node_modules\express\lib\router\index.js:335:12)
at next (C:\Swapnil\Dev\Learn\Reactjs\websocket-reactjs-master\node_modules\express\lib\router\index.js:275:10)
at handleWebpackInternalMiddleware (C:\Swapnil\Dev\Learn\Reactjs\websocket-reactjs-master\node_modules\react-dev-utils\evalSourceMapMiddleware.js:42:7)
at Layer.handle [as handle_request] (C:\Swapnil\Dev\Learn\Reactjs\websocket-reactjs-master\node_modules\express\lib\router\layer.js:95:5)
TypeError [ERR_INVALID_ARG_TYPE]: The "path" argument must be of type string. Received undefined at validateString (internal/validators.js:124:11) at Object.join (path.js:424:7) at noopServiceWorkerMiddleware (C:\Swapnil\Dev\Learn\Reactjs\websocket-reactjs-master\node_modules\react-dev-utils\noopServiceWorkerMiddleware.js:14:26) at Layer.handle [as handle_request] (C:\Swapnil\Dev\Learn\Reactjs\websocket-reactjs-master\node_modules\express\lib\router\layer.js:95:5) at trim_prefix (C:\Swapnil\Dev\Learn\Reactjs\websocket-reactjs-master\node_modules\express\lib\router\index.js:317:13) at C:\Swapnil\Dev\Learn\Reactjs\websocket-reactjs-master\node_modules\express\lib\router\index.js:284:7 at Function.process_params (C:\Swapnil\Dev\Learn\Reactjs\websocket-reactjs-master\node_modules\express\lib\router\index.js:335:12) at next (C:\Swapnil\Dev\Learn\Reactjs\websocket-reactjs-master\node_modules\express\lib\router\index.js:275:10) at launchEditorMiddleware (C:\Swapnil\Dev\Learn\Reactjs\websocket-reactjs-master\node_modules\react-dev-utils\errorOverlayMiddleware.js:20:7) at Layer.handle [as handle_request] (C:\Swapnil\Dev\Learn\Reactjs\websocket-reactjs-master\node_modules\express\lib\router\layer.js:95:5) at trim_prefix (C:\Swapnil\Dev\Learn\Reactjs\websocket-reactjs-master\node_modules\express\lib\router\index.js:317:13) at C:\Swapnil\Dev\Learn\Reactjs\websocket-reactjs-master\node_modules\express\lib\router\index.js:284:7 at Function.process_params (C:\Swapnil\Dev\Learn\Reactjs\websocket-reactjs-master\node_modules\express\lib\router\index.js:335:12) at next (C:\Swapnil\Dev\Learn\Reactjs\websocket-reactjs-master\node_modules\express\lib\router\index.js:275:10) at handleWebpackInternalMiddleware (C:\Swapnil\Dev\Learn\Reactjs\websocket-reactjs-master\node_modules\react-dev-utils\evalSourceMapMiddleware.js:42:7) at Layer.handle [as handle_request] (C:\Swapnil\Dev\Learn\Reactjs\websocket-reactjs-master\node_modules\express\lib\router\layer.js:95:5)