Admiror Gallery cannot create thumbnails in /home/milos/public_html/plugins/content/admirorgallery/admirorgallery/thumbs/Polipropilenske-kese-za-testenine/
Check folder permmisions!
Admiror Gallery: 4.5.0
Server OS:Apache/2.4.62 (Unix) OpenSSL/1.0.2k-fips
Client OS:Unknown
PHP:5.6.40