/lib/private/setup.php access error | failed to open stream: No such file or directory

Hi there. I install nextcloud with php 71 ,mariadb and nginx on centos7. I got it managed that I saw the installation page and filled it out. After that I saw errors in then nexcloud.log that the file /lib/private/setup.php could not be readed. The file exists. I tiried it multiple times but with the same result. Any suggestions ?
Error Message:
file_get_contents(/usr/share/nginx/html/.htaccess): failed to open stream: No such file or directory at /usr/share/nginx/html/lib/private/Setup.php#434",“level”:3,

[root@centi private]# pwd
/usr/share/nginx/html/lib/private
[root@centi private]# ls -la Set*.php
-rw-r-----. 1 root nextc 15804 Jan 9 19:03 Setup.php

Make sure your nginx user has full access to your nextcloud install directory
as it will need to modify files.

chown nginx.nginx YOUR_NEXTCLOUD_INSTALL_DIR -R
chmod ug+rwX,o-rwx YOUR_NEXTCLOUD_INSTALL_DIR -R