Admiror Gallery cannot create thumbnails in /var/www/clients/client29/web37/web/plugins/content/admirorgallery/admirorgallery/thumbs/visitministre/
Check folder permmisions!
Admiror Gallery: 4.5.0
Server OS:Apache/2.4.10 (Debian)
Client OS:Unknown
PHP:5.6.38-0+deb8u1