is a Web Component then add 'CUSTOM_ELEMENTS_SCHEMA' to the '@NgModule.schemas' of this component to suppress this message. code example
Example 1: add 'CUSTOM_ELEMENTS_SCHEMA' to the '@NgModule.schemas' of this component to suppress this message
import { NgModule, CUSTOM_ELEMENTS_SCHEMA } from '@angular/core';
...
@NgModule({
declarations: [ ... ],
exports: [ ... ],
imports: [ ... ],
schemas: [ CUSTOM_ELEMENTS_SCHEMA ]
})
Example 2: 2. If 'app-navbar' is a Web Component then add 'CUSTOM_ELEMENTS_SCHEMA' to the '@NgModule.schemas' of this component to suppress this message.
import { NgModule, CUSTOM_ELEMENTS_SCHEMA } from '@angular/core';