That did the trick. Idexes increased by 20. After that I've pasted the cashu (which minibits helpfully logs) and sent it directly to the receiver. They were able to claim it. Thank you once again

I was able to revert the pending one.

It is very strange that the ERROR results in the funds being lost or unavailable to either the sender or the receiver. At the very least, there should be a revert or cancel button - just like there is one for pending transactions.

It went from status DRAFT, to PREPARED, to PENDING, and ultimatwly ti ERROR. The error name is MINT_ERROR, and the message is "outputs already signed". Params code 11003. Is this enough?