ErrorException [ 2 ]: file_put_contents(): Only 0 of 218 bytes written, possibly out of free disk space ~ SYSPATH/classes/kohana/log/file.php [ 91 ]

Fatal error: Uncaught exception 'ErrorException' with message 'Unknown: open(/var/lib/php5/sess_97utv0rhscrir0n0cg8hvm9nl7, O_RDWR) failed: No space left on device (28)' in Unknown:0
Stack trace:
#0 [internal function]: Kohana_Core::error_handler(2, 'Unknown: open(/...', 'Unknown', 0, NULL)
#1 {main}
  thrown in Unknown on line 0