component is not a known element angular 9

My component choose-popup-data-reference have module (declare and export), which is imported in docName module. If ‘mat-label’ is an Angular component, then verify that it is part of this module. If 'mat-option' is a Web Component then add 'CUSTOM_ELEMENTS_SCHEMA' to the '@NgModule.schemas' of this component to suppress this message. Angular: Template parse errors selector name is not a known … When you visualize this error, you need to add your component class name to the “declarations” structure of the @NgModule of the AppModule. Now we have Toast service and component ready to be used in Angular application. Export Angular components as Custom Elements with “Angular … Angular Angular PrimeNg UI library conflict with Jasmine DynamicTestModule. 2. NG TEST SOLUTION: Angular 2 Karma Test 'component-name' is not a known element <= I added declarations for the offending components into beforEach(.. declarations[]) to app.component.spec.ts. If 'mat-icon' is a Web Component then add 'CUSTOM_ELEMENTS_SCHEMA' to the '@NgModule.schemas' of this component to suppress this message. is not a known element

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