If you see this message, it’s probably because you’re trying to log in with your old account file without having registered for the latest version (V3) of Swash.
You need to migrate your account to V3, which can be done by either updating your extension to the latest version and creating your email and password credentials or, if you’ve already registered on another device, merging your accounts by using your private key.
For more details on the V3 update, you can read this blog.