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import { FormsModule } from '@angular/forms';
@NgModule({
imports: [
BrowserModule,
FormsModule //<----------make sure you have added this.
],
.
})
Make sure to import your submodule in app.module.ts
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// app.module.ts
import { FormsModule } from '@angular/forms';
@NgModule({
imports: [
BrowserModule,
FormsModule //<----------make sure you have added this.
YourSubModule // <-----------your sub module if you have submodules
],
.
})