which definitely shows that it is a pooling error.
I have never joined a pool and am self-pooling my NFTs. The error only started after I plotted NFTs and goes away if I remove all my NFT directories.
So, my harvester is getting constant fails due to the farmer error. It would seem to me that I am missing my chance for reward every time this happens. The error is so common that it may be that I am not farming/harvesting my NFTs at all. This may be true for many others. Nobody in my search has found out a real answer about this error or its effect. The only good tip I got was the above link and a suggestion to wipe my config file.
Instead of just the config, I just completely wiped Chia from my system and installed 1.2.7. I then manually entered the only mnemonic ever used on this PC and finished syncing again this morning. The error immediately started occurring again.
I am pissed.
I will now try to navigate keybase and get an answer from the devs.