In the following code:

- (NSMutableArray *) fetchNotesForGroup: (NSString *)groupName {

 // Variables declaration
 NSMutableArray *result;
 NSFetchRequest *fetchRequest;
 NSEntityDescription *entity;
 NSSortDescriptor *sortDescriptor;
 NSPredicate *searchPredicate;
 NSError *error = nil;

 // Creates the fetchRequest and executes it
 fetchRequest = [[[NSFetchRequest alloc] init] autorelease];
entity = [NSEntityDescription entityForName:@"Note" inManagedObjectContext:managedObjectContext];
[fetchRequest setEntity:entity];
sortDescriptor = [[[NSSortDescriptor alloc] initWithKey:@"noteName" ascending:YES] autorelease];
[fetchRequest setSortDescriptors:[NSArray arrayWithObject:sortDescriptor]];
[fetchRequest setReturnsDistinctResults:YES];
searchPredicate = [NSPredicate predicateWithFormat:@"categoryName like %@", groupName];
[fetchRequest setPredicate:searchPredicate];
[fetchRequest setPropertiesToFetch:[NSArray arrayWithObject:@"noteName"]];
result = [[managedObjectContext executeFetchRequest:fetchRequest error:&error] mutableCopy];

 // Variables release

 return result;
}

... I Fetch notes for a given categoryName. When I'm running Instruments, it says that a NSCFString is leaking.

I know leaks are mean for iPhone developers... but I don't have any idea on how to plug this one.

Any clues? All help is welcome.

Thanks a lot!