Hi @bozana,
Same as above, HTTP Error 500, log file say
[Tue Jan 10 08:41:22.834555 2017] [fcgid:warn] [pid 12675] [client 192.168.131.1:64833] mod_fcgid: stderr: PHP Fatal error: Call to undefined method SectionDAO::getTitles() in /var/www/clients/client0/web7/web/plugins/importexport/quickSubmit/QuickSubmitForm.inc.php on line 206, referer: http://godisnjak.ff.uns.ac.rs/index.php/gff/management/tools