"weakify" macro editor error

Hi,
I'm using the  libextobjc weakify and strongify macros but AppCode gives an error even though the app builds fine.

    @weakify(self);
    [self.viewModel.updatedContentSignal subscribeNext:^(id x) {
        @strongify(self);
        [self.tableView reloadData];
    }];

 




cheers