already has more than 'max_user_connections' active connections

[kud0gfx]

Well, the last days in puntual times I've had puntual errors, all of they saying this:

Database error in vBulletin :

mysql_connect() [<a href='function.mysql-connect'>function.mysql-connect</a>]: User pordesca already has more than 'max_user_connections' active connections
/home.10.29/pordesca/www/foro/includes/class_core.php on line 311

MySQL Error   :
Error Number  :
Request Date  : Tuesday, July 1st 2008 @ 03:59:26 PM
Error Date    : Tuesday, July 1st 2008 @ 03:59:26 PM
Script        : http://pordescargadirecta.com/foro/image.php?u=1812&dateline=1213731364
Referrer      : http://pordescargadirecta.com/foro/showthread.php?p=11605
IP Address    : 170.252.72.61
Username      :
Classname     : vb_database
MySQL Version :

I have a shared plan, the 90plan in OVH concretly. I've more or less 100 active users maybe more, when it happens, is it normal? how can I fix it?

thx, anyway!