Error trying to use query builder (version 4.04)

Thanks, but I tried that and am still getting the same error. 

new code:

$builder = $this->builder();       
$builder->select('id, body, timestamp, user_id');
$builder->where('user_id', $userID);
$builder->orWhereIn('id', function(BaseBuilder $builder)
                          {
                              return $builder->select('followed_id')
                                              ->from('followers')
                                              ->where('follower_id', $userID);
                          });
$builder->orderBy('timestamp', 'DESC');
$results = $builder->get();