MySQL error in file: /engine/modules/tagscloud.php at line 42

Error Number: 3

The Error returned was:
Error writing file '/tmp/MYZ12h4G' (Errcode: 28 - No space left on device)

SQL query:

SELECT SQL_CALC_FOUND_ROWS tag, COUNT(*) AS count FROM book_tags GROUP BY tag ORDER BY count DESC LIMIT 0,40