why did i get this all of a sudden; class AppDelegate: UIResponder, UIApplicationDelegate { Thread 1; signal sigabrt

i didnt even make changes to my app :(

on the uiapplicationmain

class AppDelegate: UIResponder, UIApplicationDelegate {

Thread 1; signal sigabrt

when i build it to test on my iphone 6 it only loads the launchscreen.xib and sits on it...

any thoughts