database error

[hunter22375]

Can anyone tell me what these means or how to fix them?

Invalid SQL:

SELECT text, languageid, special
FROM vb_phrase AS phrase
LEFT JOIN vb_phrasetype USING (fieldname)
WHERE phrase.fieldname = 'error'
AND varname = 'registeremail' AND languageid IN (-1, 0, 1);

MySQL Error : MySQL server has gone away
Error Number : 2006
Request Date : Friday, May 16th 2008 @ 10:15:38 PM
Error Date : Friday, May 16th 2008 @ 10:15:49 PM
Script : http://thesourcecheck.com/forum/regi...p?do=addmember
Referrer : http://thesourcecheck.com/forum/regi...p?do=addmember
IP Address : XX.XX.XX.XX
Username : XXXXXXX
Classname : vB_Database
MySQL Version :

Database error in vBulletin 3.7.0:

Invalid SQL: UPDATE vb_datastore SET data = data - 1, data = IF(data < 0, 0, data) WHERE title = 'mailqueue';MySQL Error : MySQL server has gone away
Error Number : 2006
Request Date : Friday, May 16th 2008 @ 10:31:21 PM
Error Date : Friday, May 16th 2008 @ 10:31:36 PMScript : http://www.thesourcecheck.com/forum/index.php
Referrer : http://www.thesourcecheck.com/forum/private.php
IP Address : XX.XX.XXX
Username : XXXXXX
Classname : vB_Database
MySQL Version :

Thanks in advance.