Input dispatching timed out Waiting because no window has focus but there is a focused application

ANDROID ANR CRASH LOG:

Input dispatching timed out (AppWindowToken{3e960e4 token=Token{402c77 ActivityRecord{2996e76 u0 com.app.demoapp/.MainActivity t911}}}, Waiting because no window has focus but there is a focused application that may eventually add a window when it finishes starting up.)