I had the same issue and solved my problem by doing the following:
(assuming you're on Windows since this is literally a Microsoft forum)
1: Go to your AppData folder (C:\Users*yourUsername*\AppData)
2: Click on Local
3: Delete the folder named Frosty
Here is where found the solution: https://www.reddit.com/r/DragonAgeInqusition/comments/12csuz8/frosty_mod_error/
Yes, I'm aware this is a dead post.
-Pyxelator Xeroc