Not sure exactly about that error, but I have found playing around with sample rate and bit depth in Audition can help solve audio errors / issues. If you adjust these, does it have any effect?
If not, could you share here or DM me your audio file via a shared link on Google Drive, Dropbox, or Creative Cloud to take a closer look?
I tried all the sample rates, all the bit depth setting etc etc and nothing. What I did was to uninstall it and install it again, and basically to do the same and the error was still appearing, then I just decided maybe just my scene is not working properly, and i think that was the error because I tried to do the same i was doing of recording myself on audition to then put it on the scene to compute lip sync, but this time in the default scene of "Getting started" and it worked, why? No idea... My scene didn't have anything like extra or something that wouldn't allow to lip sync, it is just weird.
That is weird. If it keeps happening please let us know, and any files you can share would help.