Database Error max_user_connections
 

I've been getting these e-mails and it turns out I've been getting them since I installed. Can anyone tell me what I have to do to fix this? Thanks!
Database error in vBulletin :

mysqli_real_connect() [function.mysqli-real-connect]: (42000/1203): User NAMEREMOVED already has more than 'max_user_connections' active connections /hermes/web08/b2838/pow.USERNAMEREMOVED/DIRECTORY/forum/includes/class_core.php on line 1138

MySQL Error :
Error Number :
Request Date : Friday* November 13th 2009 @ 10:54:37 AM
Error Date : Friday* November 13th 2009 @ 10:54:37 AM
Script : http://--.com/forum/showthread.php?t=574
Referrer :
IP Address : 83.149.199.55
Username :
Classname : vB_Database_MySQLi
MySQL Version :