I need help

I have to edit an mp3.

I use to be able to do this in a round about way.

I could convert the mp3 to an AIFF sound file.
Edit this sound file in Flash, then export it as a Quicktime movie.

Then using iTunes, I was able to convert the Quicktime movie back into an mp3.

This is a lot more work than it has to be, but it worked for what I needed it for.....until now.

When I go to convert the Movie into an mp3, I get an error message now.

I have not done anything different.

Could someone help me figure out what is wrong, or could someone edit this mp3 for me?
I just need the first 30 seconds.

Thanks to anyone that can help.