Oops! Sorry, but an unexpected error occurred.

As per title, I have this error message when I try to trade certain items: "Oops! Sorry, but an unexpected error occurred."
I don't have other problems with trading, buying, selling, etc.... it happens only with some items and it's not seller dependant, i tried various sellers. It happens for sure when I try to offer specific items (e.g. I had the problem with a dress and the flow batteries) but I don't know how many items are affected.
I'm making more attempts to understand better the issue, but for now nothing came to light precisely.
Any advice?

Thanks, (:


edit: poor grammar, sorry


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