We currently have a few poor error messages in our latest release and you seem to be hitting both.
The first problem about the sync is safe to ignore. It is a code-path that is designed for wallet recovery and you shouldn’t use it. We have merged a fix but didn’t release it (yet).
The second issue about is about boarding. We have changed the behavior of the server to only allow using vtxos once their funding transaction has been confirmed onchain.
When you try to spend them you will get an error message. You can wait a block and the error message will disappear. The current error message is a bit misleading though.