Authorisation on my pc has been lost, when I try to reactivate I get the following error message "code: E_AUTH_NOT_READY" What can I do?

For some reason I can not get into my ADE and get the error message "code:  E_AUTH_NOT_ READY      Digital Editions encountered an error on the activiation server.

What can I do as it will not let transfer items to my Sony reader.  Thank you