NoClassDefFoundError on an interface, not a class

Question

I have an issue with NoClassDefFoundError. I am using interfaces, and no class definition should be available:

package code;
public interface Co         


        

Answer 1

Any Interface must declared inside class.

public class Calbacks {
    public interface IBaseFragmentInterface {
        void NotifyMainActivity();
    }
}

*I very long find resolution of this problem, but i find resolution independently by the method of scientific poking