Uncaught (in promise): Error: Angular JIT compilation failed: ‘@angular/compiler’ not loaded! in angular 9

If you are like me and wound up here from google.
My error came when I included an Angular Material Component, rather than it’s module in app.module.ts

special note: whenever you add a new material module to app.module.ts you must stop (and restart) ng serve or you will get this error.

change this

imports: [
   BrowserModule,
   HttpClientModule,
   AppRoutingModule,
   BrowserAnimationsModule,
   MatDialog, // <====== this is the error
],

to this

imports: [
   BrowserModule,
   HttpClientModule,
   AppRoutingModule,
   BrowserAnimationsModule,
   MatDialogModule, // <====== this is the solution
],