Play back recorded files

I have recorded several sets using Pro 3 and S3 Controller. I am now getting an error message when I go to play back a set I recorded - BPM Detection cannot be executed.

I contacted Native and got the following:

Are you attempting to play back your recorded sets within Traktor? Traktor is not designed to handle audio files of this type / size, it is only designed to play individual tracks. 

Please play your set outside of Traktor in a different audio playback software. 

If you need any further assistance, or the issue is something different, please let us know. 

Best regards,

Rich @NI

As I type this I am playing a recorded set I have done a few weeks ago.

Can someone please help.

Thanks.