MySQL Error!

The Error returned was:
Can't connect to local MySQL server through socket '/tmp/mysql.sock' (61)

Error Number:

Warning: Unknown: open(/home/admin/data/mod-tmp/sess_m99eg1q66rmesjlbubs3i3irn1, 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 (/home/admin/data/mod-tmp) in Unknown on line 0