Fatal error: Uncaught Error: Class "fs" not found in /volume1/web/projects/spaceticker.app.src/panels/_app.actions.php on line 13

Error: Class "fs" not found in /volume1/web/projects/spaceticker.app.src/panels/_app.actions.php on line 13

Call Stack:
    0.0001     360048   1. {main}() /volume1/web/projects/spaceticker.app.src/panels/body.tpl.php:0
    0.0001     360432   2. require_once('/volume1/web/projects/spaceticker.app.src/panels/_app.actions.php') /volume1/web/projects/spaceticker.app.src/panels/body.tpl.php:8