Error Mysql vbulletin 3.8.4

[Steve Machol]

That error means:

Error code 28: No space left on device

One or more partitions on your server is out of space or doesn't have enough space to complete this operation. Shutdown your forums (if you can) and contact your host immediately. You or your host will need to find out which partition is low on space and free up some more space.

Here is an explanation of the error on the MySQL site:

http://www.mysql.com/news-and-events...000000249.html

[Jackie1]

There I failed Mysql that ko is a way to fix that before.

Database error in vBulletin 3.8.4:

Invalid SQL:

SELECT userid, username, lastpost,posts
FROM user
ORDER BY username
LIMIT 0,318373;

MySQL Error : Error writing file '/tmp/MYBc0BQn' (Errcode: 28)
Error Number : 3

please just fix my problem