Admiror Gallery cannot create thumbnails in /var/www/clients/client46/web77/web/plugins/content/admirorgallery/admirorgallery/thumbs/portfolio/Slubne/
Check folder permmisions!
Admiror Gallery: 4.5.0
Server OS:Apache/2.2.22 (Debian)
Client OS:Unknown
PHP:5.4.44-0+deb7u1