Sometimes when exporting to MP3 format, you may get an unexpected error message saying that the file has not been exported.

Programs
Soundtrack Pro 3

Solution

Even if the message says that the file has not been exported, in some cases it is still in the process of being exported. You may find the file on your hard drive in the location you specified. If you can't find the exported file, try exporting it to another format, such as AIFF, and use Compressor to convert it to MP3.