NSPredicate 'El lado izquierdo para un operador ALL o ANY debe ser NSArray o NSSet'

Not totally sure why this isn't working now, i thought it had been working previously. Does anyone see an issue with this FetchRequest construction?

- (NSArray *)entriesForDate:(NSDate *)date {
    NSFetchRequest *request = [[NSFetchRequest alloc]initWithEntityName:@"Entry"];
    NSPredicate *predicate = [NSPredicate predicateWithFormat:@"ANY addedOn.unique like %@", [T3Utility identifierForDate:date]];
    request.predicate = predicate;

    NSError *error = nil;
    NSArray *matches = [self.database.managedObjectContext executeFetchRequest:request error:&error];

    return matches;
}

Again, i'm 99% sure that this code has been working until recently, so im thinking perhaps there's something else going on in my code somewhere . . .but when i run it through the debugger this is where is hangs. Here is my error:

The left hand side for an ALL or ANY operator must be either an NSArray or NSSet

¿Alguna idea?

gracias!