I can't manage my wishlists at all today; I get a blank "error" screen when I try to synchronize with Brickset, and I get a pop-up error when I try to update the note on an individual item in my wishlist.
It looks like there are some issues with the Brickset API any moment. I have made several changes to the code so it should not error when you are just trying to update your WishList. When you try to synchronise manually, it will let you know if there is an issue, gracefully.
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