Unexpected value imported by the module 'AppModule'. Please add an annotation

[KeyStorke]

🐞 Bug report

Command (mark with an x)

- [ ] new
- [ ] build
- [x] serve
- [ ] test
- [ ] e2e
- [ ] generate
- [ ] add
- [ ] update
- [ ] lint
- [ ] xi18n
- [ ] run
- [ ] config
- [ ] help
- [ ] version
- [ ] doc

Description

I see the issue and that issue looks like a bug. The demo here: https://stackblitz.com/edit/angular-rbzdus

The same problem happens for ng build --prod as well.

🔬 Minimal Reproduction

You can do it here

MatSnackBar used in the notification.component.ts

🔥 Exception or Error

Unexpected value 'MatSnackBar' imported by the module 'AppModule'. Please add a @NgModule annotation.

Anything else relevant?
#7409

[clydin]

It appears the demo is importing the component and not the module.

[KeyStorke]

The issue was resolved.
Solution: change MatSnackBar to MatSnackBarModule in the module.ts

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