What does that error say?
Also, what format/codec are the assets you're using?
Nobody can tell you anything without proper system info or other technical details.
I'm just guessing here. Your audio is a compressed format like an MP3. Open up the audio track in Audition and save it as a 48 khz 16 bit PCM uncompressed wav file and then replace the compressed file with the WAV file in the timeline.