I am not going to deceive anyone here, if you do not know the way to solve my problem, then there is no need to worry.
Ok. As I said, your wallet file is probably corrupted and that's why you get that error when trying to make a tranasction.It's possible that the addresses you have in your wallet file are not associated with the xpub and xprv you have.
Don't you get the following error when you open the wallet?
