Fatal error: Uncaught Error: Class 'PhutilSignalHandler' not found in /home/cybertoast/sites/phab.cybertoast.com/arcanist/src/future/exec/PhutilCallbackSignalHandler.php:4 Stack trace: #0 {main} thrown in /home/cybertoast/sites/phab.cybertoast.com/arcanist/src/future/exec/PhutilCallbackSignalHandler.php on line 4