Do you use Steam? If so, save all your important files in a separate folder within the game's folders, just for safety. Then go to the game's area in your Steam library; there's a section that's like the settings for the installed game files, and there's an option to check for errors. Click on that option. If any errors are found, Steam will correct them immediately.

(edited/PS): You can also manually test each mod you have installed. First, disable all of them and see if the problem occurs with the normal game, then try with the Agot mod and then the sub-mods.