i checked your code its working complete fine...
but you have to set below in your appDelegate method
LogInViewController *loginVC = [[LogInViewController alloc] initWithNibName:@"LogInViewController" bundle:nil];
UINavigationController *navController=[[UINavigationController alloc]initWithRootViewController:loginVC];
self.window.rootViewController = navController;
as per your Console Log i can say that
you created one method called -(IBAction)textEnd:(id)sender{} before and linked that method to anywhere to button or textfied and now you removed that method and you forget to remove that method link from file inpector...
just double check your link from file inspector that all methods are available or not...
i got same error when i create -(IBAction)textEnd:(id)sender{} method and linked to UITextfield to EditingDidEnd action from file inpector and than i remove method whole method from my .m file and i got same error on click of login button so check your all links are have availabled linked methods