Hello I have the following problem. I created app in laravel on my computer with Win 10, PRO, 64-bit, PHP Version 7.3.2 and it works super. But when I copy app on server with Debian 8.3, PHP version 7.3.6 it's not working. When I try I have white page nothing else. I check app logs in apache2 and I have this error: "PHP Parse error: syntax error, unexpected '?' in /var/www/shopapp/vendor/laravel/framework/src/Illuminate/Foundation/helpers.php on line 500". What i can do more to run this app?