NG6002: Appears in the NgModule.imports of AppModule, but itself has errors - upgrade

Question

I am upgrading my angualr from 6 to 13.0.2.
When I do ng build , I get an error:
NG6002: Appears in the NgModule.imports of AppModule, but itself has errors 33 export class AdminModule { }
I am sure, Admin module imports doesn't include any components, all components are part of declarations: []
Not sure what the error is related to. I also upgarded angualr material to 13.0.2.
I tried to setenableIvy to false in tsconfig.app.json.
"angularCompilerOptions": {
"enableIvy" : false,
admin.module.ts
import { CUSTOM_ELEMENTS_SCHEMA, NgModule, NO_ERRORS_SCHEMA } from '#angular/core';
import { CommonModule } from '#angular/common';
import {MatRadioModule} from '#angular/material/radio';
import { ReactiveFormsModule, FormsModule } from '#angular/forms';
import { NgxSpinnerModule } from 'ngx-spinner';
import { MatNativeDateModule } from '#angular/material/core';
import { MaterialModule } from 'src/app/material/material.module';
#NgModule({
imports: [
CommonModule,
MaterialModule,
MatRadioModule,
ReactiveFormsModule,
FormsModule,
NgxSpinnerModule,
MatNativeDateModule
],
declarations: [AdminComponent],
schemas: [CUSTOM_ELEMENTS_SCHEMA]
})
export class AdminModule { }
app.module.ts
#NgModule({
declarations: [AppComponent, LoginComponent, HomeComponent],
imports: [
AdminModule,
NgxSpinnerModule,
MatDialog,
NgxSliderModule
],
schemas: [CUSTOM_ELEMENTS_SCHEMA],
,
providers: [
],
bootstrap: [AppComponent],
})
export class AppModule {}