Getting an error in Angular when creating a new component and using its selector name as an...

I'm new to angular and have been following tutorials I've created a new angular component in angular 20 and trying to use its selector as a custom html tag in the app componenet everything is as described in tutorials but I'm getting these errors X [ERROR] NG8001: 'app-header' is not a known element:

1. If 'app-header' is an Angular component, then verify that it is part of this module.
2. If 'app-header' is a Web Component then add 'CUSTOM_ELEMENTS_SCHEMA' to the '@NgModule.schemas' of this component to suppress this message. [plugin angular-compiler]

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