title: Angular 7 - getting error: 'rxjs has no exported member 'Observable'
body: <p>This is my <code>package.json</code> file:</p>
  
  <pre><code>"dependencies": {
      "@angular/animations": "~7.1.0",
      "@angular/common": "~7.1.0",
      "@angular/compiler": "~7.1.0",
      "@angular/core": "~7.1.0",
      "@angular/forms": "~7.1.0",
      "@angular/material": "^7.1.1",
      "@angular/platform-browser": "~7.1.0",
      "@angular/platform-browser-dynamic": "~7.1.0",
      "@angular/router": "~7.1.0",
      "core-js": "^2.5.4",
      "ng2-opd-popup": "^1.1.21",
      "rxjs": "~6.3.3",
      "tslib": "^1.9.0",
      "zone.js": "~0.8.26"
  </code></pre>
  
  <p><code>service.ts</code> file code as below:</p>
  
  <pre><code>import { Injectable } from '@angular/core';
  import { Http, Headers} from '@angular/http';
  import 'rxjs/add/operator/map';
  //import { Observable } from 'rxjs/Observable';
  //import   'rxjs/add/observable';
  import { Observable} from 'rxjs';
  @Injectable({
    providedIn: 'root'
  })
  export class EmpService {
    employees=[];
    constructor(private _http: Http) { }
    addEmployee(info){
      return this._http.post("http://localhost/data/insert.php",info)
        .map(()=&gt;"");
    }
  }
  </code></pre>
  
  <p>I got the following error:</p>
  
  <blockquote>
    <p>rxjs has no exported member 'Observable'</p>
  </blockquote>
  
  <p>Is there any kind of issues in versions?</p>