I'm trying out the new version 2.0 of AFNetworking and I'm getting the error above. Any idea why this is happening? Here's my code: NSURL *URL = [NSURL URLWithString:kJSONlink]; NSURLRequest *request = [NSURLRequest requestWithURL:URL]; AFHTTPRequestOperation *op = [[AFHTTPRequestOperation alloc] initWithRequest:request]; op.responseSerializer = [AFJSONResponseSerializer serializer]; [op setComple