If these files were not configured when Nexus Mod Manager was installed the Mods will not work with the game. ini files inside the data folder of the game have to be properly configured to work with the Nexus Mod Manager and the game. Now that you have a basic understanding of the nature of the problem we will move forward towards the solutions. This can happen if the version numbers of the Mods are very old and they haven’t been updated to work with the latest version of the Nexus Mod Manager.