Failed Upload File Music On Hold

I install Asterisk now 1.5 with Freepbx
I try upload mp3 file to music on hold.
I choose file and click upload, after some second my web page say:
"The connection was reset
The connection to the server was reset while the page was loading

  • The site could be temporarily unavailable or too busy. Try again in a few
  • If you are unable to load any pages, check your computer’s network
  • If your computer or network is protected by a firewall or proxy, make sure
    that Firefox is permitted to access the Web.
    File not uploading.

When i try now upload small wav file and i get:
Error Processing: “sox: Can’t open input file ‘/var/lib/asterisk/mohmp3/orig_mail.wav’: No such file or directory” for mail.wav!

Please HELP.