Error message

• Warning: mysqli_connect(): (HY000/1040): Too many connections in require() (line 2 of /var/www/html/greatertzaneen/connection.php).
• Warning: mysqli_query() expects parameter 1 to be mysqli, boolean given in include() (line 27 of /var/www/html/greatertzaneen/sidebar.php).
• Warning: mysqli_fetch_array() expects parameter 1 to be mysqli_result, null given in include() (line 28 of /var/www/html/greatertzaneen/sidebar.php).