由于未捕获的异常'NSInvalidArgumentException'而终止应用

I am not getting an error now but my delegate is not working. I am making a custom keyboard so i have the UIViewController and a UIView. I want the UIView to call the sendKeyboardShortCut method in the UIViewController. The sendKeyboardShortCut method is not being called. Thank YouI am not getting an error now but my delegate i