URGENT HELP! No space left on device (28) in Unknown on line 0

I only used up less than 5gigs of 20gigs but this errors shows up. What to do next?

Warning: write failed: No space left on device (28) in Unknown on line 0

Warning: Failed to write session data (files). Please verify that the current setting of session.save_path is correct (/tmp) in Unknown on line 0

 

 

 

 

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