AsteriskNow 1.7 32 bit Music on hold

i am using AsteriskNow 1.7, and i try to upload the mp3 and wav files to be my music via the web interface(FreePBX) but it never finishes and always shows me errors!!!

Error Processing: “sh: mpg123: command not found
sox: Can’t open input file ‘/var/lib/asteriskmoh/orig_Java Jive (Coffee Prince cut).wav’: No such file or directory” for Java Jive (Coffee Prince cut).mp3!
This is not a fatal error, your Music on Hold may still work.
Before i uploaded the file, i opened the file musiconhold_additional.conf, and i see that the default directory is var/lib/asterisk/moh, but once i upload the file via the web, the directory in musiconhold_additional.conf always changes to
Please help me to solve this problem.
Thank you very much