Fatal error: Uncaught PDOException: SQLSTATE[42S22]: Column not found: 1054 Unknown column 'u.username' in 'SELECT' in /var/www/html/Forum/post.php:18
Stack trace:
#0 /var/www/html/Forum/post.php(18): PDOStatement->execute()
#1 {main}
thrown in /var/www/html/Forum/post.php on line 18