Hi sha,
Thanks for your message, and welcome to deSEC! 
It seems like your domain does no longer exist. This can happen if you don’t change your DNS information for 180 days and then ignore two warning emails that we sent. (See §2 and §3 of our Terms.)
If this is the problem and the domain expired less then a week ago, we can help you restore it. In this case, please contact support.
Otherwise, registration of names under dedyn.io is currently disabled (see dynDNS service down? - #3 by peter for details). We are planning to re-enable at the end of this year or early next year.
Stay secure,
Peter