Warning: Unknown()

Nevite co se deje kdyz se mi zobrazi tyto hlasky?
Warning: Unknown(): write 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 (/tmp) in Unknown on line 0
Doma na lokalnim storji mi to funguje ale tady to porad vypisuje tyhle zvasty... :( nevite co je to za problem?