Help recover lightning channels

I stopped running my lightning node on August 17, 2023, I have now turned it on again and upgraded to umbrelOS 1.1. While trying to recover my old channels using the backup file provided by the Umbrel Lightning node application, I keep getting this error → Unable to recover channel backup, unable to unpack chan backup: could not derive private key for legacy channel revocation root format: unable to derive private key

What can I do?