I have some issues with a certain wallet and hope that someone could help me.
1) What is the meaning of this error:

2) When I attempt to import the seed of this wallet, it says no active addresses found and refuses to import it.
3) I do have a full backup of the wallet, but it results in the error as described in point 1.
Is your wallet up-to-date (version 1.9.0) and synced (and is it light or full)?
It seems the error happens when you are trying to send, is it bytes or blackbytes?
So both your attempts to recover from the seed and from a full backup on a fully synced up-to-date full wallet have failed?
Do you remember doing anything
special before the error started appearing?