error NG6002: Appears in the NgModule.imports of AppModule, but could not be resolved to an NgModule class

Question

First time using firestore and I\'m getting this error. It seems to be a problem with Ivy, from my research. I don\'t have a lot of experience modifying tsconfig.app.json, w

Answer 1

This works for me

1. Stop the ng server(ctrl+c)

2. Run Again

   npm start / ng serve --open
   

Answer 2

Fixed it by opting out of Ivy as per documentation.

https://angular.io/guide/ivy

Change tsconfig.app.json to opt out of Ivy.

"enableIvy": false

Answer 3

This error occurs so often for me when i kept running ng serve on and trying to import same modules like RouterModule etc.

Every time restarting the application works fine for me (ng serve) .

Answer 4

Your module is not yet loaded by the Angular Server in node ng serve, so restart your server so the server loads the module that you just added in @NgModule app.module.ts

Answer 5

Try to restart the server and launch it back using npm start

Answer 6

I was adding service to module i.e. app.module.ts. I added it into imports array instead of providers array.

@NgModule({
  imports: [
    MyService // wrong here
  ],
  providers: [
    MyService // should add here
  ]
})
export class AppModule { }