Angular – Why I get error at the service in Angular 6

I have a service:

import { EventEmitter, Injectable } from '@angular/core';

@Injectable()
export class PingOnActionListenerService {
    removingListener = new EventEmitter();

    removeListener(): void {
        this.removingListener.emit();
    }

At component A I call the service:

this._pingOnActionListenerService.removeListener();

At component B I want to listen to the service:

    ngOnInit() {
        this._pingOnActionListenerService.removingListener.subscribe(this.deactivatelistener());
    }

    deactivatelistener() {
        window.removeEventListener('click', this.pingIfLastPingIsOld);
    }

When I run this code,
I get at the console the error message:

core.js:1671 ERROR TypeError: generatorOrNext is not a function
at SafeSubscriber.schedulerFn [as _next] (core.js:3565)
at SafeSubscriber.push../node_modules/rxjs/_esm5/internal/Subscriber.js.SafeSubscriber.__tryOrUnsub (Subscriber.js:195)
at SafeSubscriber.push../node_modules/rxjs/_esm5/internal/Subscriber.js.SafeSubscriber.next (Subscriber.js:133)
at Subscriber.push../node_modules/rxjs/_esm5/internal/Subscriber.js.Subscriber._next (Subscriber.js:77)
at Subscriber.push../node_modules/rxjs/_esm5/internal/Subscriber.js.Subscriber.next (Subscriber.js:54)
at EventEmitter.push../node_modules/rxjs/_esm5/internal/Subject.js.Subject.next (Subject.js:47)
at EventEmitter.push../node_modules/@angular/core/fesm5/core.js.EventEmitter.emit (core.js:3537)
at PingOnActionListenerService.push../src/app/core/services/ping-on-action/ping-on-action-listener.service.ts.PingOnActionListenerService.removeListener (ping-on-action-listener.service.ts:19)
at CatchSubscriber.selector (logging-interceptor.ts:45)
at CatchSubscriber.push../node_modules/rxjs/_esm5/internal/operators/catchError.js.CatchSubscriber.error (catchError.js:33)