Property 'post' does not exist on type 'ServerURLInterceptor'. ?

[svsh227]

Hi There, I am using angular2-interceptors but when i am trying to call a POST/GET method then this error occurred : Property 'post' does not exist on type 'ServerURLInterceptor'.

Please suggest me what I do now.

My code is:

interceptorService.ts:

import { Interceptor, InterceptedRequest, InterceptedResponse } from 'ng2-interceptors';
export class ServerURLInterceptor implements Interceptor {
    public interceptBefore(request: InterceptedRequest): InterceptedRequest {
         console.log(request);
        return request;
        /*
          You can return:
            - Request: The modified request
            - Nothing: For convenience: It's just like returning the request
            - <any>(Observable.throw("cancelled")): Cancels the request, interrupting it from the pipeline, and calling back 'interceptAfter' in backwards order of those interceptors that got called up to this point.
        */
    }

    public interceptAfter(response: InterceptedResponse): InterceptedResponse { 
           console.log(response);
           return response;
        /*
          You can return:
            - Response: The modified response
            - Nothing: For convenience: It's just like returning the response
        */
    }
}

app.module.ts:

import { NgModule                                     }   from '@angular/core';
import { BrowserModule                                }   from '@angular/platform-browser';
import { MaterialModule                               }   from '@angular/material';
import { AppComponent                                 }   from './app.component';
import { AppRoutingModule                             }   from './app-routing.module';
import { LoginComponent                               }   from './components/login/login.component';
import { FormsModule                                  }   from '@angular/forms';
import { LoginService                                 }   from './helper/services/login.service';

import { InterceptorService       } from 'ng2-interceptors';
import { ServerURLInterceptor     } from './helper/interceptor/interceptorService';
import { XHRBackend, RequestOptions } from '@angular/http';
export function interceptorFactory(xhrBackend: XHRBackend, requestOptions: RequestOptions, serverURLInterceptor:ServerURLInterceptor){ // Add it here
  let service = new InterceptorService(xhrBackend, requestOptions);
  service.addInterceptor(serverURLInterceptor); // Add it here
  console.log("interceptor");
  return service;
}

@NgModule({
  imports:      [ MaterialModule.forRoot(),BrowserModule,AppRoutingModule,FormsModule
                ],

  declarations: [ AppComponent,             LoginComponent,
                ],

  providers: [ LoginService,
  ServerURLInterceptor,
  {
      provide: InterceptorService,
      useFactory: interceptorFactory,
      deps: [XHRBackend, RequestOptions, ServerURLInterceptor] // Add it here, in the same order as the signature of interceptorFactory
    }
             ],                                         
  bootstrap:    [ AppComponent ]
})
export class AppModule { }

login.service.ts:

import { Injectable             } from '@angular/core';
import { Observable             } from 'rxjs/Observable';
import { Http                   } from '@angular/http';
import { ServerURLInterceptor     } from '../../helper/interceptor/interceptorService';

@Injectable()
export class LoginService{
    // constructor(private http:Http){}
    constructor(private http:ServerURLInterceptor){}

login(username:string,password:string){
    console.log(username+" , "+password+" in LoginService");
    debugger;
    return this.http
               .post(`http://localhost:4100/login`,{email: username,password:password});
            //    .map(response => response.json().data);
  }
}