“YOU INSERTED AN INVALID NEWSOMATIC KEY” ??

I have been using newsomatic for a month, then I re-copied the key into the dash because it looked strange, but now when I try to post articles, it says: "YOU INSERTED AN INVALID NEWSOMATIC KEY" Where can I find my newsomatic key?  I've literally looked everywhere, in all emails.  I've also sent an email to support@coderevolution.ro on Aug 9 or so,  requesting the key, but have not received a reply yet.