title: ERROR in Cannot resolve type entity i9.NgxFileDropModule to symbol
body: <p>I have migrated angular 8 to version 10. Application is using custom angular library which is also being migrated from version 7 to 10.
  this library has NgxFileDropModule which is imported as</p>
  <pre><code>(import { NgxFileDropModule } from 'ngx-file-drop';)
  </code></pre>
  <p>but the error is thrown in main application <strong>ERROR in Cannot resolve type entity i9.NgxFileDropModule to symbol</strong>
  How do I get rid of this issue
  P.s. library is compiled and built well but main application throws error which has dependency on library</p>