Keep getting this error while trying to play after the game patched to 1.05. It downloaded through the Uplay client and installed without an error, then this appears on boot. Clicking OK sends me to the patch webpage. I downloaded the exe file and ran that, it says it's installed after about a second and the same error appears on trying to launch.
I'd rather avoid downloading the entire game again as my internet speed is pretty terrible and it would take days to do.