Hello,
Regarding the lost cards:
AnkiHub does not delete any cards you have created in Anki. You may be referring to Anki itself; when you clicked Sync in Anki, you were likely prompted with a confirmation message from AnkiWeb (not AnkiHub). You might have then clicked “download from AnkiWeb” instead of “upload to AnkiWeb.” This could have overwritten your local Anki collection with an older version stored in the cloud.
As you mentioned, you can always restore from a backup created before the incident occurred: How to Restore from Backup
Please note that your AnkiHub account is different from your AnkiWeb account. Please visit the two websites below to make sure you have the correct login credentials for each:
- AnkiWeb: https://ankiweb.net
- AnkiHub: https://ankihub.net/
AnkiWeb is the cloud backup service for Anki itself, while AnkiHub is the service used to download your deck and keep it up to date.
Regarding the error message:
Please ensure you are using the latest version of Anki. You can download it here: https://apps.ankiweb.net/
After downloading, simply run the file to update your application.