[MODULE] WHMCS

[cybercoder]

I just installed latest version of sentora & lates version of WHMCS module, But there's just blank page when try to manage WHMCS module.
The log file: /var/sentora/logs/sentora-error.log

Code:

PHP Parse error:  syntax error, unexpected '[' in /etc/sentora/panel/modules/whmcs/code/controller.ext.php on line 201, referer: x.x.x.x/?module=moduleadmin&action=EditModule

and it refers to this static function:

Code:

    static function getCurrentUserID()
    {
        return ctrl_users::GetUserDetail()["userid"];
    }

But i can't see any unexpected '[' !!!!!!!!!
How can fix this?