Failed to sign unsigned tx: Hot wallets cannot import outputs

[jack-dot-wu]

I use the only-view wallet to get the unsigned_txset with api transfer_split. And use the normal wallet to sign the unsigned_txset, but it show '{'code': -42, 'message': 'Failed to sign unsigned tx: Hot wallets cannot import outputs'}'.what is the cold wallet. How to create it?

[selsta]

It means that this wallet has been used together with an online node before. A cold wallet has to be created on an offline system.