trying to authorise a new ereader (kobo glo) and get a message "Activation server error.

I'm trying to authorise my new ereader (kobo glo), have downloaded the latest version of digital editions but keep getting an error message

Activation Server Error. Code E_AUTH_NOT_READY  Digital Editions encountered an error on the activation server"

Have tried several times over several days without success.  Can anyone help??