Error: 'app-header' is not a known element despite adding 'CUSTOM_ELEMENTS_SCHEMA'

Even though the 'app-header' component is being rendered in the browser, the content in the corresponding "header.component.ts" or "header.component.html" is not being displayed.



error: 'app-header' is not a known element:
If 'app-header' is an Angular component, then verify that it is part of this module.
If 'app-header' is a Web Component then add 'CUSTOM_ELEMENTS_SCHEMA' to the '@NgModule.schemas' of this component to suppress this message.ngtsc(-998001)


Here's what I've tried so far:

• I have verified that 'app-header' is indeed part of the module.
• I have added 'CUSTOM_ELEMENTS_SCHEMA' to the '@NgModule.schemas' of the module to suppress the error.

My goal is to resolve this issue and ensure that the content in 'app-header' is displayed as expected ("header works").

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