ERROR in node_modules/rxjs/Observable.d.ts(1,15): error TS2307: Cannot find module 'rxjs-compat/Observable'.

Hi Guys ,

Today I have faced this error :

ERROR in node_modules/rxjs/Observable.d.ts(1,15): error TS2307: Cannot find module 'rxjs-compat/Observable'.

I faced this error since i didn't installed material module. Here's the solution if you face the same  issue.
Go to the command prompt and type the following command:

npm install --save rxjs-compat 

Once installed ng serve,it should work.

The full stack trace is as below :

ERROR in node_modules/rxjs/Observable.d.ts(1,15): error TS2307: Cannot find module 'rxjs-compat/Observable'.

node_modules/rxjs/Rx.d.ts(1,15): error TS2307: Cannot find module 'rxjs-compat'.

src/app/quiz-service.service.ts(4,10): error TS2305: Module '"F:/shahbaz/study/angular4/projects/mcq/mcq/node_modules/rxjs/Observable"' has no exported member 'Observable'.

src/app/quiz-service.service.ts(14,5): error TS2339: Property 'map' does not exist on type 'Observable<Response>'.