This has been seen even though the audio files are all of the same sample rate. It can occur when the video clips in the Avid sequence were digitized with mixed audio sample rates, even though the exported audio is all of the same sample rate. If you receive this error, the Avid sequence must first have all of its video master clips reconsolidated as video-only clips, so that they are not related to any audio. Then the sequence may be exported for use in Pro Tools.