Angular 6 'mat-button-toggle' is not a known element

Question

I\'ve checked those questions:

• 'mat-toolbar' is not a known element - Angular 5
• Jhipster / md-button is not a known element
• Template

Answer 1

mat-button-toggle is available as a part of the MatButtonToggleModule So you'll have to import that as well.

Add an import statement for the same in your AppModule:

import {MatButtonToggleModule} from '@angular/material/button-toggle';

And then add it to the imports array as well so that AppModule's templates can understand what mat-button-toggle is.

Also, I'm not really sure why you've exported these modules from your AppModule. We generally export anything from a module if we are planning on importing that module in some other module. But since this is the AppModule, and thus your RootModule, I don't think you'll be importing it in any other module. That might not be the case though.