Plz fix this error(lucky block sky block)

I purchased “lucky block sky block by BBB studios” in market place. And I played the world. While I played the world, I found critical error. In the world, there is “trade island”. However, when I tried to trade, the minecraft app is closed !̆̈ !̆̈ !̆̈ Plz fix this critical error or refund plz.