Unresolved reference: DaggerAppComponent

depedencies i have used

 // Dagger
    implementation 'com.google.dagger:dagger:2.21'
    implementation 'com.google.dagger:dagger-android:2.21'
    implementation 'com.google.dagger:dagger-android-support:2.21'
    kapt 'com.google.dagger:dagger-android-processor:2.20'
    kapt 'com.google.dagger:dagger-compiler:2.20'

within App class i havee

val component: AppComponent by lazy {
        DaggerAppComponent.builder()
            .appModule(AppModule(this))
            .build() // No need for casting here
    }

AppComponent Class I have

@Singleton
@Component(modules = [
    AndroidInjectionModule::class,
    AppModule::class,
    ActivityModule::class,
    ServiceModule::class,
    BroadcastReceiverModule::class
])
interface AppComponent {
    fun inject(app: PragueApp)
}

I have already try all solution available but nothing works for me. it says Unresolved reference: DaggerAppComponent, I have check in build generated files, DaggerAppComponent class is available but don’t know whats wrong.