If you are trying to load a module that is a part of base game or one of the official DLCs and you are encountering such error message, then most likely one of the game's configuration files was corrupted. Please do the following:
- Close the game. While in Windows Desktop press WinKey+R to open Run window in it paste:
And press Ok. You will be navigated to the Documents folder. Here find Neverwinter Nights folder and delete it. After that, restart the game. The game will recreate the game's configuration folder.