title: Angular 7 + ngx-bootstrap 3.1.3
body: <p><a href="https://stackblitz.com/edit/angular-uc6czc" rel="nofollow noreferrer">Here</a> is a blank angular 7 project in stackblitz, in Angular 6 I used <code>constructor(private bsModalRef: BsModalRef)</code> so I  can pass values to my child popup component. </p>
  
  <p>But when I update to angular 7, it said <code>Module not found: Error: Can't resolve 'ngx-bootstrap/modal/bs-modal-ref.service'</code>.</p>
  
  <p>In stackblitz, it asked me to install ngx-bootstrap but I already installed.</p>
  
  <p>Any idea?</p>