My b2evolution Version: 2.x

My blog is not working, when opening the backoffice I get this messages:

MySQL error!

Can't create/write to file '/tmp/#sql_625a_0.MYI' (Errcode: 13)(Errno=1)

also:

Your query:

SELECT DISTINCT evo_comments.*

FROM evo_comments INNER JOIN evo_items__item ON comment_post_ID = post_ID INNER JOIN evo_postcats ON post_ID = postcat_post_ID
INNER JOIN evo_categories othercats ON postcat_cat_ID = othercats.cat_ID

WHERE othercats.cat_blog_ID = 2

AND comment_type IN ('comment','trackback','pingback')

AND comment_status IN ('draft')

AND ( ( post_status = 'private'

AND post_creator_user_ID = 7 )

OR post_status IN ('published','protected') )

ORDER BY comment_date DESC, comment_ID DESC

LIMIT 5

I Repaired the DB in my cPanel but it didn't get better. Any ideas?