Warning: mysql_connect(): MySQL server has gone away in /home/ultimate/public_html/include/classes.inc.php on line 21

Warning: mysql_connect(): Error while reading greeting packet. PID=63532 in /home/ultimate/public_html/include/classes.inc.php on line 21

Warning: mysql_connect(): MySQL server has gone away in /home/ultimate/public_html/include/classes.inc.php on line 21
I cannot connect to the database because: MySQL server has gone away