@[deleted] thank you, sorry but last time i can't upload the error image.the problem was with mailing, osticket doesn't has permissions to send mail and i resolved this issue.Now i have a different one!, when i print ticket as pdf the Arabic language appear like squares !! when i was on windows server on (XAMPP) i solve that with import XB Riyaz and XB Zar librarys, But now i use Linux Centos 7 the issue reappeared can you help me please ?