I'm going to be honest, I'm about to become sick of Magma's errors. I just decided to sync my song to be even more accurate, and now I'm getting this. It was working fine before. I'm not even sure what that means, any help would be appreciated.
EDIT -- Oops, due to some weird circumstances involving frozen drives on my computer, after a reboot the "Embed Tempo Mad" checkbox defaulted back to unchecked which is what caused this very descriptive and helpful error.