Go to your bin folder and check if there is a folder named "_backup". If yes, then either your base game itself has problems, or you just did something wrong. If not, then check if there is a folder named "Age of Empires III". If not, that's weird. If yes, then open it and move all of its content to the "bin" folder.
If none of what I said happened, then I think you should reinstall the mod and this time, be sure to check out everything before continuing.
(fr) Regarde à travers et vois le cygne et ce qui vit au-delà de l'au-delà.