TypeError: You provided an invalid object where a stream was expected. You can provide an Observable, Promise, Array, or Iterable

Question

I am trying to map from a service call but getting an error. Looked at subscribe is not defined in angular 2? and it said that in order to subscribe we need to

Answer 1

I've had this error when there's been different RxJS-versions across projects. The internal checks in RxJS fails because there are several different Symbol_observable. Eventually this function throws once called from a flattening operator like switchMap.

Try importing symbol-observable in some entry point.

// main index.ts
import 'symbol-observable';