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.
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