Issue setting up SWYH on multiple computers for SONOS

Hi,
I’ve managed to successfully set up SWYH on one of my computers and it works very well… Thanks for such a great product.

I’ve tried to set it up on my wife’s computer and I keep getting the error message “Unable to play ‘swyh.mp3’ – the song is not encoded properly. I was getting this error on mine before I set it up properly. I’m sure I set it up properly on her computer, but obviously I’ve done something wrong OR there is something stopping me setting it up on a second computer…

Are you able to help me at all?
Thanks
Michael