当加入mainmodule后无法自动生成DaggerAppComponent

TravelMateApp .java

public class TravelMateApp extends DaggerApplication {
@Override
    protected AndroidInjector<? extends DaggerApplication> applicationInjector() {
        return DaggerAppComponent.create();
    }
        }

AppComponent.java

@Singleton
@Component(modules = {
        ActivityBindingModule.class,
        AndroidSupportInjectionModule.class})
public interface AppComponent extends AndroidInjector<DaggerApplication>{

    @Override
    void inject(DaggerApplication instance);
}

ActivityBindingModule.java

@ActivityScoped
    @ContributesAndroidInjector(modules = MainModule.class)
    abstract MainActivity mainActivity();

MainModule.java

@Module
public abstract class MainModule {

    @FragmentScoped
    @ContributesAndroidInjector
    abstract HomeFragment homeFragment();

    @FragmentScoped
    @ContributesAndroidInjector
    abstract DiscoveryFragment discoveryFragment();

    @FragmentScoped
    @ContributesAndroidInjector
    abstract ContactFragment contactFragment();

    @FragmentScoped
    @ContributesAndroidInjector
    abstract MeFragment meFragment();
}

build.gradle

/*Dagger2*/
    implementation 'com.google.dagger:dagger:2.15'
    annotationProcessor 'com.google.dagger:dagger-compiler:2.15'
    /*Dagger-Android*/
    implementation "com.google.dagger:dagger-android:2.15"
    implementation 'com.google.dagger:dagger-android-support:2.15'
    annotationProcessor 'com.google.dagger:dagger-android-processor:2.15'