After reinstalling, only install the most important mods and animations. Therefore, the best way to proceed after getting this error is to conduct a complete reinstall of the game and the mods. Some animations/mods might not be compatible with each other and they might cause issues with the application. When you install mods and add animations they seem to pile on each other and start accumulating. With most users, reinstallation of the Game after removing all the mods installed seems to fix the issue. Note: Make sure that you are using the FNIS XXL version and not the other one before proceeding with the other steps.

Therefore, if you are using Mod Organizer, clear the Overwrite folder and check to see if the issue persists. Mod Organizer has an overwrite folder that contains the excess files and Nexus Mod Manager also places these files inside the directory. Most Users that are modding their game use either Nexus Mod Manager or Mod Organizer to make the implementation of the mods easier and their management more convenient.

Fnis mod organizer 2