/c/default/js/DB.js net::ERR_ABORTED 500 (Internal Server Error)

[tuantmb]

I followed the guide in wiki and finish all steps but after I logged in to server, I received the message "/c/default/js/DB.js net::ERR_ABORTED 500 (Internal Server Error)" in Firefox Developer Console & checking log, I got the following lines:

[2018-11-13 11:22:00] request.INFO: Matched route "app_serve_js_db". {"route_parameters":{"_controller":"Casebox\\CoreBundle\\Controller\\JSDBController::indexAction","coreName":"default","_route":"app_serve_js_db"},"request_uri":"https://x.x.x.x:8443/c/default/js/DB.js"} []
[2018-11-13 11:22:00] security.DEBUG: Read existing security token from the session. {"key":"_security_main"} []
[2018-11-13 11:22:00] security.DEBUG: User was reloaded from a user provider. {"username":"root","provider":"Symfony\\Bridge\\Doctrine\\Security\\User\\EntityUserProvider"} []
[2018-11-13 11:22:00] request.CRITICAL: Uncaught PHP Exception Symfony\Component\Debug\Exception\FatalErrorException: "Compile Error: Cannot use 'Object' as class name as it is reserved" at /var/www/casebox/vendor/caseboxdev/core-bundle/src/Service/Objects/Object.php line 36 {"exception":"[object] (Symfony\\Component\\Debug\\Exception\\FatalErrorException(code: 0): Compile Error: Cannot use 'Object' as class name as it is reserved at /var/www/casebox/vendor/caseboxdev/core-bundle/src/Service/Objects/Object.php:36)"} []
[2018-11-13 11:22:00] security.DEBUG: Stored the security token in the session. {"key":"_security_main"} []
[2018-11-13 11:22:01] request.INFO: Matched route "app_serve_js_db". {"route_parameters":{"_controller":"Casebox\\CoreBundle\\Controller\\JSDBController::indexAction","coreName":"default","_route":"app_serve_js_db"},"request_uri":"https://x.x.x.x:8443/c/default/js/DB.js"} []
[2018-11-13 11:22:01] security.DEBUG: Read existing security token from the session. {"key":"_security_main"} []
[2018-11-13 11:22:01] security.DEBUG: User was reloaded from a user provider. {"username":"root","provider":"Symfony\\Bridge\\Doctrine\\Security\\User\\EntityUserProvider"} []
[2018-11-13 11:22:01] request.CRITICAL: Uncaught PHP Exception Symfony\Component\Debug\Exception\FatalErrorException: "Compile Error: Cannot use 'Object' as class name as it is reserved" at /var/www/casebox/vendor/caseboxdev/core-bundle/src/Service/Objects/Object.php line 36 {"exception":"[object] (Symfony\\Component\\Debug\\Exception\\FatalErrorException(code: 0): Compile Error: Cannot use 'Object' as class name as it is reserved at /var/www/casebox/vendor/caseboxdev/core-bundle/src/Service/Objects/Object.php:36)"} []
[2018-11-13 11:22:01] security.DEBUG: Stored the security token in the session. {"key":"_security_main"} []

Please help me to fix this!