I also want to combine btc from multiple wallet to single address, but I am getting strange error while sending from bitcoin core wallet. I have checked I have sufficient balance to pay fee. error i got is Signature must be zero for failed check multi sig operation. Have anyone idea what can be the issue and how to resolve it.
Signature(?) is invalid.
You sure your bitcoin core is updated, and you're not trying to broadcast a transaction that is incorrectly build / is spending outputs that are no longer valid? Or using conflicting versions(?)