Bitcore-wallet-client “Server response could not be verified”

I’m getting an error trying to sign a transaction with bitcore-wallet-client.

I create the transaction, publish it and when I try to sign it, I’m getting the error: “SERVER_COMPROMISED – Server response could not be verified”

bws server: https://bws.bitpay.com/bws/api

can anyone point me in the right direction?

ps: using wallet-client (CLI) I can sign the same transaction (created and published from bitcore-wallet-client)

edit: I’m using a testnet account