typolight-check.php missing files

Hello,

I am trying to install tl 2.7.2 on a linux machine (I have full access with admin priviledges).
First, the typolight-check.php gives me "file missing" for several files

I checked and doublechecked on the server, and the files do exist.
What do I do wrong?

Thanx,
Dan

P.S. ecerpt
system/modules/backend/config • 664 775, 755, 750 www-data www-data Folder
system/modules/backend/config/.htaccess • - 664, 644, 640 • - www-data Missing
system/modules/backend/config/config.php • - 664, 644, 640 • - www-data Missing
system/modules/backend/config/database.sql • - 664, 644, 640 • - www-data Missing
system/modules/backend/dca • 664 775, 755, 750 www-data www-data Folder
system/modules/backend/dca/.htaccess • - 664, 644, 640 • - www-data Missing
system/modules/backend/dca/tl_article.php • - 664, 644, 640 • - www-data Missing

Check the file owner / group. Maybe files belongig to the wrong owner are hidden for security reasons.

Thank you,
that was the problem.
Can't see the forest from the trees.