Just starting up on this, but so far no joy. I'm getting a similar message:
Google Voice text message to X10 translator
Using the following credentials:
GV Username: xxxxxxx
GV Password: *************
Your Google Voice username appears to be invalid. Google Voice uses your e-mail
address as the username.
I know it's not invalid, so I'm not sure why it's upset.
Also, assuming this can be resolved, if I have google forward my email, won't I be charged a fee? I have unlimited txt through my carrier, so I just want to verify that GV won't start charging if I request a status. If so, I could rewrite things to send via an email.