[users@httpd] client denied by server configuration: /var/www/html/roundcubemail/

[Wolfgang Paul Rauchholz]

I run apache version httpd-2.4.6-45.el7.centos.x86_64

The web server is up and running. I can access webmail (roundcube) and
photo galley (piwigo).
When uploading pictures I get above message which I find in
/var/log/httpd/error_log.

In roundcubemail, deleting emails sometimes I get he same message, but this
time it is in  different file: in /var/log/httpd/ssl_error_log, being  a
problem of the secure sockets layer?

Underneath part of the httpd.conf file. What am I doing wrong?

<Directory />
    AllowOverride none
    Require all denied
</Directory>

DocumentRoot "/var/www/html"
AccessFileName .htaccess
HostnameLookups Off

<Location /server-status>
    SetHandler server-status
    Require all granted
    #Order deny,allow
    #Deny from all
    Allow from .<my-domain>
    Allow from 127.0.0.1 10.5.2.0/24
</Location>

<Location /server-info>
    SetHandler server-info
    Require all granted
    #Order deny,allow
    #Deny from all
    Allow from .<my-domain>
    Allow from 127.0.0.1 10.5.2.0/24
</Location>

<Directory /var/www>
    AllowOverride None
    # Allow open access:
    Require all granted
</Directory>

<Directory /var/www/html>
    Options Indexes FollowSymLinks
    AllowOverride None
    Require all granted
</Directory>

Thanks for your help, Wolfgang