Attempt to invoke virtual method

{plp.cs4b.thesis.drawitapp/plp.cs4b.thesis.drawitapp.PlayGame}: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String plp....

(12745): java.lang.NullPointerException: Attempt to invoke virtual method 'int android.view.View.getImportantForAccessibility()' on a null object ...

Attempt to invoke virtual method 'java.lang.String java.lang.Object.toString()' on a null object reference at android.widget.ArrayAdapter.createViewFrom...

I am trying to get current user data using parse, every time i run this activity I get this message Attempt to invoke virtual method 'java.lang....

java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.ImageView.setOnClickListener(android.view.View$OnClickListener)' on a ...

NullPointerException: Attempt to invoke virtual method 'android.os.Looper android.content.Context.getMainLooper()' on a null object reference at android....

java.lang.NullPointerException: Attempt to invoke virtual method 'java.util.List android.net.Uri.getPathSegments()' on a null object reference GitHub | ...