how to solve this error of Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'Source type 1 not available'

I have working on pick the photo from gallery and save in gallery

my code is

-(void)onclicksave:(id)sender
 {
     NSLog(@"onclicksave");
     UIImagePickerController *picker=[[UIImagePickerController alloc]init];
     picker.delegate=self;
 
     if((UIButton *)sender== openLibrary)
     {
         picker.sourceType=UIImagePickerControllerSourceTypeSavedPhotosAlbum;
 
     }
     else
     {
         picker.sourceType=UIImagePickerControllerSourceTypeCamera;
     }
 
     [self presentModalViewController:picker animated:YES];
 
 }
 
 -(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
 {
     [picker dismissModalViewControllerAnimated:YES];
     imagedisplay.image=[info objectForKey:@"UIImagePickerControllerOriginalImage"];
 
 }
 

but in this code run time error like

Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'Source type 1 not available'

so give any suggestion and source code which is apply in my code

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