Thanks. I couldnt download smultron but today i decided to work on this issue. So when i was searching the hosts file in my mac i found another one which was used for youtube allowance before (because it was not allowed in the country there was this hosts file change thing). I deleted the youtube lines there then i found the hosts file in /etc folder and replace it with the deleted one AND THE PROBLEM SOLVED! so happy for today:D And thanks again for pointing out that folder issue!