This means that the password you entered in the coin adapter settings does not match the one in your conf file.
In Bitcoin there are two ways to specify RPC API credentials: rpcauth/rpcpassword, and rpcauth. Use one or the other, but not both. Check that the password you’ve entered in the coin adapter settings matches the password in your wallet config.
A common problem is if your password contains the = character. This cannot be used with rpcpassword, as the = character is used as a separator between key and value in the .conf file. The simplest solution is not to use a password with the = character.
Also check that the IP in your rpcallowip clause in in CIDR notation, i.e. it should have something in it specifying the network class (see here).