I have looked your code and you need to remove the outlet in story board from twitter icon button.You connected that previously. You have commented previous outlet method -(IBAction)Twitter
but you also need to remove touchupinside action outlet from storyboard.Just go iphoneFirstPageView.xib
and right click on twitter button and remove action outlet for Twitter.
For another problem in -(void)executeSegue
You are loading whole viewcontroller from xib so use TwitterViewController *newController = [[[NSBundle mainBundle] loadNibNamed:@"TwitterViewController" owner:self options:nil] objectAtIndex:0];
instead of initWithNibName
and remove the fileowner outlet for view.Then Everything will work fine.