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Audacity is a very good free audio editing program that can work with many formats, including mp3. When you download Audacity you do not get the LAME MP3 codec pre-installed because of software patents so you need to install it yourself.

To solve the error, Launch Audacity, open the mp 3 file you want to edit then save it. During the save process you will get the error. What you can do is click on the download button on the window error. This will take you to a web page where you can download the file that will get rid of the error.

You can get more details of this error on the Audacity home page