error: supertypes of the following classes cannot be resolved. Please make sure you have the required dependencies in the classpath

Question

I can\'t compile my Android Kotlin project.

I have no idea what is this...

Gradle log:

error: supertypes of the following classes ca

Answer 1

In my case, I had removed an unused OnFragmentInteractionListener in a fragment:

public interface OnFragmentInteractionListener {
    // TODO: Update argument type and name
    void onFragmentInteraction(Uri uri);
}

However, In my activity I had failed to remove a reference to this OnFragmentInteractionListener :

public class MainActivity extends AppCompatActivity implements
        MyFragment.OnFragmentInteractionListener {

Strangely, instead of giving an error that indicated the OnFragmentInteractionListener was not found, I received the above "supertypes of the following classes cannot be resolved" with no reference to the classes.