Is that definitely the only message you get as that tends to follow on from another one that is the real cause of the problem, like the one that was fixed when found after 5.4.1 came out.
If that is the only error message then, are there any other addons including nUI plugins installed ? If so turn them off and have just nUI running. Preferably the latest one so we are all pretty much on the same page, including the fix for the error I mentioned above which you should find a link to on the many 5.4.1 bug posts.
|