Unhandled ErrorException (code: 2)

» \ErrorException

file_put_contents(/tmp/session/ad4f7515472dfb3b480b9b303dbb9a66AobNAX8bWD): Failed to open stream: No space left on device

 #0 [internal function]: coco\exception\CocoExceptionHandler::coco\exception\{closure}()
 #1 /opt/vendor/continue/nano-app/src/session/store/SessionFilestore.php(124): file_put_contents()
 #2 /opt/vendor/continue/nano-app/src/app/NanoApp.php(190): nanoapp\session\store\SessionFilestore->save()
 #3 /opt/vendor/continue/nano-app/src/app/NanoApp.php(159): nanoapp\app\NanoApp->loadSession()
 #4 /opt/src/app/SosApp.php(130): nanoapp\app\NanoApp->__construct()
 #5 /opt/www/index.php(67): sos\app\SosApp->__construct()
 #6 {main}