Error: Can't resolve 'rxjs/BehaviorSubject'

[suchidomelo]

i am leaning Angular 5 and trying to create functionality of Social Login,
so i have installed angular5-social-login library via npm and called that library in app,module.ts file.
At that time of calling to that library , it throws below error:

./node_modules/angular5-social-login/angular5-social-login.umd.js
Module not found: Error: Can't resolve 'rxjs/BehaviorSubject' in 'D:\angular_project\myangular5\node_modules\angular5-social-login'

can someone help me with this error