« MODx Parse Error »

MODx encountered the following error while attempting to parse the requested resource:
« PHP Parse Error »
 
PHP error debug
  Error: Unknown: open(/var/lib/php/session/sess_b1tbfe9cmo1dhqpgsq63jg6go3, O_RDWR) failed: Disk quota exceeded (122) 
  Error type/ Nr.: Warning - 2 
  File: Unknown 
  Line: 0 
 
Parser timing
  MySQL: 0.0005 s(0 Requests)
  PHP: 0.0204 s 
  Total: 0.0208 s