in Angulr 6 - this is not working

[j-Cis]

ERROR

   Date: 2018-06-30T08:16:24.797Z - Hash: 264674c502d70f319ecb - Time: 5897ms
   4 unchanged chunks
   chunk {main} main.js, main.js.map (main) 54.6 kB [initial] [rendered]
   i ｢wdm｣: Compiled successfully.
   ERROR in node_modules/ng2-pipe/node_modules/rxjs/Subject.d.ts(24,5): error TS2416: Property 'lift' in       type 'Subject<T>' is not assignable to the same property in base
   type 'Observable<T>'.
  Type '<T, R>(operator: Operator<T, R>) => Observable<T>' is not assignable to type '<R>(operator:    Operator<T, R>) => Observable<R>'.
       Type 'Observable<T>' is not assignable to type 'Observable<R>'.
         Type 'T' is not assignable to type 'R'.