MySQL Error!

The Error returned was:
Can't create/write to file '/tmp/#sql_4f2_0.MYI' (Errcode: 28)

Error Number:

Warning: Unknown: open(/var/www/nolamers/data/mod-tmp/sess_jjvrf594tujh72gjrktfts3l57, O_RDWR) failed: No space left on device (28) in Unknown on line 0 Warning: Unknown: Failed to write session data (files). Please verify that the current setting of session.save_path is correct (/var/www/nolamers/data/mod-tmp) in Unknown on line 0