Error in linq-entity query function

public BoardPost GetPostByID(Int64 PostID)
    {
           BoardPost result = null;
           using(FisharooDataContext dc = _conn.GetContext())
          {
               BoardPost post = dc.BoardPosts.Include("Account").Where(p =>  
                   p.PostID == PostID).FirstOrDefault();
               result = post;
               result.Account = post.Account;
          }
           return result;
  }