Re: 'error bitrate too high' even after ac3 concersion

i'm just trying to burn a disc in studio pro, as normal. But there's something about the audio file that is producing this error.
i've tried other audio conversions including ac3. I've tried another computer.
the original file was a quicktime. I compressed video to mpg2 as normal, and sound to aiff as normal.
the sound is definitely the problem, and everyone suggested converting to ac3. i did so, but the same error appears, even with bitrate at it's lowest?

can you think of anything else i should try?

thanks