When trading with a Villager he runs out of trades after some trading (red cross).
Normaly he can trade again after some time, but that doesn't happen in my world. I tried staying a whole day (20min) next to the Villager, but nothing changes. I also tried wandering around the Village (about 10min), still no change. Then I went mining for about 30min, still nothing happens.
I also tried trading other things till i got the red cross on all trades and waited a while. But still no trades available.