Admiror Gallery cannot create thumbnails in /var/www/clients/client11/web18/web/2017-01-01/plugins/content/admirorgallery/admirorgallery/thumbs/pacjeci/
Check folder permmisions!
Admiror Gallery: 4.5.0
Server OS:Apache/2.2.15 (CentOS)
Client OS:Unknown
PHP:5.3.3