'material-icon' is not a known element. If FooComponent isn't declared in any . Asking for help, clarification, or responding to other answers. If you are wondering why we don't resolve support issues via the issue tracker, please check out this explanation. 2. If 'ngx-datatable' is a Web Component then add 'CUSTOM_ELEMENTS_SCHEMA' to the '@NgModule.schemas' of this component to suppress this message. You seem to be duplicating your imports (you import MatSelectModule in app.module and material.module).. 03.02.2021 (20284) Failed to compile. Angular Errors NG8001 'mat-form-field' is not a known element + NG8002 ... and in your app module import the shared module and use all the components. error NG8001: 'swiper' is not a known element Code Example When using 11.x, you need to select one of two variants:. Error: 'app-header' is not a known element: Angular 2 ブラウザのコンソールに . If 'fa-icon' is an Angular component and it has 'icon' input, then verify that it is part of this module. error 'ng0304 is not a known element 2. Description: I have an Ionic app that is already almost done. Thank you Edric, I forgot to also add the DialogInModuleComponent to the Declarations Array! https://readdy.net/Notes/Details/1827Angular Error NG8001: 'mat-progress-spinner' is not a known element:Angular Error is an Angular component, then verify t. If 'app-welcome-slider' is a Web Component then add 'CUSTOM_ELEMENTS_SCHEMA' to the '@NgModule.schemas' of this component to suppress this message. error ng8001 is not a known element - cyrilsancereau.com component is not a known element angular 10. Angular - error NG8001: 'mat-step' is not a known element routing navigate method not redirecting to targeted component 1 Config route in seperate file and consume in app.module.ts , HTML and component.ts file angular 5/6 Angular - error NG8001: 'mat-step' is not a known element