objective c - IOS Open New View controller Programatially -


i need open registration form on application programatically, view controller created on storyborad storybpard id viewcontrollerregister , code have used open form 

registrationformviewcontroller *registerview = [self.storyboard instantiateviewcontrollerwithidentifier:@"viewcontrollerregister"];           [self presentviewcontroller:registerview animated:no completion:nil];

but when run application, getting error like,

terminating app due uncaught exception 'nsinvalidargumentexception', reason: '* -[__nsarraym insertobject:atindex:]: object cannot nil' * first throw call stack:

1) make sure storyboardname "main" or different.

enter image description here

2) check have entered proper storyboard identifier.

enter image description here

and finally,

3) xcode can't able find storyboard self.storyboard. try mention storyboard actual name like,

uistoryboard *storyboard = [uistoryboard storyboardwithname:@"main" bundle:[nsbundle mainbundle]];          registrationformviewcontroller *registrationformviewcontroller = [storyboard instantiateviewcontrollerwithidentifier:@"registrationformviewcontroller"];         [self presentviewcontroller:registrationformviewcontroller animated:yes completion:nil];

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