I am not sure this is the cause, but when I got this message I had extra potions in the bank. When I moved the extra potions to my shared bank, I stopped getting the error.
My guess, was that the game saw the potions in the bank first, and tried to use them, and cound not really use them.
I have seen this kind of behaviour with L&L pieces. If you have a L&L piece in the bank, and one in your inventory, and you examine it and use it, it will use the piece in the bank, and leave the one in your inventory.
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