Upgrade went wrong

Hello all,
I just upgrade from nextcloud 10 to nextcloud 11 using the manual procedure.
Everything went well except that now I’m not able to acces to nextcloud.
I get “Forbidden
You don’t have permission to access /index.php on this server.”

I’m using Nextcloud 11 on apache with centos 7 and php 7

What am I missing ?

maybe something simple like file-permissions for the apache/www-data user?

I’ve checked that
I’ve done :
chown -R apache:apache nextcloud
find nextcloud/ -type d -exec chmod 750 {} ;
find nextcloud/ -type f -exec chmod 640 {} ;

And the permisions is :
-rw-r----- apache apache index.php

retyping : chown -R apache:apache nextcloud
did everything working again