[Gn_Snake]

Hi,
after import plugin, the system error:

Database error in vBulletin 3.5.4:

Invalid SQL:
CREATE TABLE HG_usergroup (arcadepermissions int(10) unsigned NOT NULL, PRIMARY KEY ());

MySQL Error  : Errore di sintassi nella query SQL vicino a '))' linea 1
Error Number : 1064
Date         : Monday, July 3rd 2006 @ 10:53:12 PM
Script       : http://127.0.1/forum/admincp/plugin.php
Referrer     : http://127.0.1/forum/admincp/plugin.php?do=productadd
IP Address   : 127.0.0.1
Username     : ****
Classname    : vb_database

Help Me!!