Blank page to the installation of Gav

Hello ! I just installed Grav on my web server, but I get a blank page. I tried to look in the documentation, without success. So I think the problem is with the php configuration of my server. Can you help me please ? The location of my info.php is:

Hi, in addition to pointing you to the Troubleshooting page, can you turn error reporting to the maximum so you can see an error instead of a blank page?

How should I do it ?

Google is your friend: