vBulletin Database Error!

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=====================
Database error in vBulletin 3.7.4:

Invalid SQL:
SELECT username FROM user WHERE userid =;

MySQL Error : You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '' at line 1
Error Number : 1064
Request Date : Saturday, December 20th 2008 @ 03:40:36 PM
Error Date : Saturday, December 20th 2008 @ 03:40:36 PM
Script : http://www.m-naghm.com/vb/mohamed/read_pms.php?do=read&user id=&pmtextid=784
Referrer : http://www.m-naghm.com/vb/********/read_pms.php?do=latest
IP Address : **.***.***.***
Username : **********
Classname : vB_Database
MySQL Version : 5.0.67-community-log====================== ========الرساله التاليهDatabase error in vBulletin 3.7.4:

Invalid SQL:

UPDATE session
SET lastactivity = 1229797398, location = '/vb/mohamed/email.php?do=dosendmail&d o=dosendmail', inforum = 0, inthread = 0, incalendar = 0, badlocation = 0
WHERE sessionhash = 'db0aa20cbabbd12be22488ed 12dd23f9';

MySQL Error : MySQL server has gone away
Error Number : 2006
Request Date : Saturday, December 20th 2008 @ 11:23:18 AM
Error Date : Saturday, December 20th 2008 @ 11:24:31 AM
Script : http://www.m-naghm.net/vb/mohamed/email.php?do=dosendmail
Referrer : http://www.m-naghm.net/vb/******/index.php?do=home
IP Address : **.**.***.**
Username : *******
Classname : vB_Database
MySQL Version :

----------------------------Database error in vBulletin 3.7.4:

Invalid SQL:
INSERT INTO y2ksw_imgcache (ID) VALUES (0);

MySQL Error : MySQL server has gone away
Error Number : 2006
Request Date : Saturday, December 20th 2008 @ 10:39:06 AM
Error Date : Saturday, December 20th 2008 @ 10:41:32 AM
Script : http://www.m-naghm.net/vb/newthread.php?do=postthre ad&f=8
Referrer : http://www.m-naghm.net/vb/newthread.php?do=newthrea d&f=8
IP Address : **.**.**.***
Username : ********Classname : vB_Database
MySQL Version :
========================= Database error in vBulletin 3.7.4:

Invalid SQL:

SELECT maxnewthread, maxnewtime FROM usergroup
WHERE usergroupid=19,0;

MySQL Error : You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '0' at line 2
Error Number : 1064
Request Date : Friday, December 19th 2008 @ 11:02:02 AM
Error Date : Friday, December 19th 2008 @ 11:02:02 AM
Script : http://www.m-naghm.com/vb/newthread.php
Referrer :
IP Address : **.**.**.**
Username : غير مسجل
Classname : vB_Database
MySQL Version :
===================== ارجو ايجاد حل لهذة الاخطاء الي بتجيلي علي البريدشكرا لكم

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