[SQL] erreur alors que j'ai rien toucher !!!

Couldn't obtain category list.
 
DEBUG MODE
 
SQL Error : 1 Can't create/write to file '/tmp/#sql3c5_8270_3.MYI' (Errcode: 13)
 
SELECT c.cat_id, c.cat_title, c.cat_order FROM phpbb_categories c, phpbb_forums f WHERE f.cat_id = c.cat_id GROUP BY c.cat_id, c.cat_title, c.cat_order ORDER BY c.cat_order
 
Line : 120
File : /data/members/free/multimania/fr/xx/xx/xx/xxx/htdocs/includes/functions.php