error when build project

[bolerap]

Hi @vimalavinisha
I'm using angular2-image-popup package on my project. I got issue when building
ERROR in [at-loader] ./node_modules/angular2-image-popup/node_modules/@angular/core/node_modules/rxjs/Subject.d.ts:16:22 TS2415: Class 'Subject<T>' incorrectly extends base class 'Observable<T>'. Types of property 'lift' are incompatible. Type '<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'.
Please take a look.