When I tried to add a new activity in a dummy new Android application, it was fine. However when I tried to add a new activity for this specific project, there was a red error pop up on the right corner (not showing up in attachment, don't know why) when I clicked nothing happened. I clicked at the bottom left where its saying IllegalStateException but nothing happened either. I clicked everywhere and nothing happened, I couldn't even hit Cancel or the X button to close. How do I find out what the error was? I basically have to End Task just to get out of this screen, and it is puzzling.