objective c - Pressing UIButton results in Unrecognized Selector error -

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I have a button in my UIView that is created like this: 

  UIBarButtonItem * editButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem: UIBarButtonSystemItemEdit Goal: auto operation: @selector (toggleEdit)]; Self.navigationItem.rightBarButtonItem = editButton; [Edit Button Release];   
 And this is the action method:  
  - (zero) toggleEdit: (id) this {}   
 But I get this error  
 
 2011-09-02 15: 27: 13.362 blubb [15006: 207] - [DatabaseSelectionViewController toggleEdit]: Unfolded selector sent for example 0x5a29d80 2011-09 -02 15: 27: 13.365 blubb [15006: 207]  *  Unexpected exception 'NSInvalidArgumentException', the application ended due to reason: '- [DatabaseSelectionViewController toggleEdit]: Unrecognized selector example 0x5a29d80 Sent to '  
 Why is this happening?  
 
 
 change  
  @selector (toggleEdit)  < / Pre> 
  to 
  @selector (toggleEdit :)

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