SyncBack cannot connet to remote machine

I am trying to backup my local drive to a network drive. I am doing this manually through the SyncBack user interface (not via the scheduler). I get the following error message (Mars is the name of the remote machine):

"Cannot connect to Mars: The specified password in invalid."

Now I am connected to the remote machine and I can see the network drive through Windows Explorer. So why is SyncBack not able to access it?

Thanks,