Fatal error: Constant expression contains invalid operations in /volume1/web/app/Sys/SystemException.php on line 31

Call Stack:
    0.0000     362128   1. {main}() /volume1/web/index.php:0
    0.0001     364624   2. Start->__construct() /volume1/web/index.php:22
    0.0001     364656   3. config->ClassAutoLoader($class = 'SystemException') /volume1/web/app/Sys/Start.php:43