I have a decred wallet which I created at https://wallet.decred.org. I have backed up seed words and backup json file. So far I did not have any problems with wallet. Last time I entered to my wallet 2-3 weeks ago. But today when I tried to access it using seed words I got error saying "Could not import: Wallet not registered at the wallet service. Recreate it from "Create Wallet" using "Advanced Options" to set your recovery phrase "; My seed words never changed, the modified date of txt file containing seed words show 2017 July (the date it was created).