Let's get this fixed. Follow these steps in order, testing the game after each significant change to pinpoint the solution.
Copy all .dll and .exe files into the as SkyrimSE.exe . skyrim racemenu error you are running skse version 0000 link
Sometimes the error is not SKSE, but rather an outdated plugin trying to use a file that no longer exists. Let's get this fixed
Your SKSE version does not match your Skyrim game version (e.g., trying to use an SE version with AE). skyrim racemenu error you are running skse version 0000 link