compiler error related to 'save' method of NSUserDefaultsController

FROM : Chris Heimark
DATE : Sun Nov 11 23:04:03 2007

The below code snippet causes 3 warnings which make no sense to me.

/Users/chris/Development/CHmessenger/CHmessenger.mm:627: warning: 
multiple methods named '-save:' found

/Developer/SDKs/MacOSX10.4u.sdk/System/Library/Frameworks/
AppKit.framework/Headers/NSUserDefaultsController.h:46: warning: 
using '-(void)save:(id)sender'

/Developer/SDKs/MacOSX10.4u.sdk/System/Library/Frameworks/
CoreData.framework/Headers/NSManagedObjectContext.h:128: warning: 
also found '-(BOOL)save:(NSError **)error'

Has anyone ever seen this before? I am running Tiger 10.4.10 & XCode 
2.4.1. My usage of the method exactly mimics the class definition so 
I am very confused.

Chris

- (void)applicationWillTerminate:(NSNotification *)aNotification
{
   [[NSFileManager defaultManager] removeFileAtPath:tempApplication 
handler:self];

   if ([[NSUserDefaultsController sharedUserDefaultsController] 
hasUnappliedChanges])
   {
       [[NSUserDefaultsController sharedUserDefaultsController] save:self];
   }
}