No such file or directory (2) error on using any server action

Getting this error when trying to run any server action… All the actions work fine on local server but they don’t after I published it into an online target…

{“code”:0,“file”:"/magapp/dmxConnectLib/lib/core/Session.php",“line”:9,“message”:“PHP Startup: open(/tmp/sess_3cqdjm113c5br6f5l67tsfe4rj, O_RDWR) failed: No such file or directory (2)”,“trace”:"#0 [internal function]: exception_error_handler()\n#1 /magapp/dmxConnectLib/lib/core/Session.php(9): session_start()\n#2 /magapp/dmxConnectLib/lib/App.php(38): lib\core\Session->__construct()\n#3 /magapp/dmxConnect/api/konfig/kategorieLista.php(5): lib\App->__construct()\n#4 {main}"}

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