Yes it is when you have a lord as prisoner. Sell him alone then you can sell all prisoners.
This game has no life and its pretty dead on MP
So if you were not "aware of the consistent server crashes, I hope you are now. The same damn issue is still not fixed. AND YES THE SERVERS CRASH EVERY SINGLE GAME!!!! In last hour I have seen 3 server crashes so yes that is every 20 mins.