Any luck?
I'm reading stories of people having no problems getting money from okpay to gox.
I asked Gox support and got a generic response that seemed to outline the steps I was already taking, and getting the error message.
Thank you for the email. Sorry for the delay in responding. You can add funds to your account from OKPay. To do so, please login, go to your Funding Options, and select OKPAY in the drop down menu.
You will need a OKPAY account to deposit via this method.
There is a 1% fee for all deposits made via OKPAY. I request you try adding funds through this mode.
For further assistance do not hesitate to contact us.
Best regards,