When I make a room in MOB MORPH mode that I bought on Marketplace in Minecraft, it stops

I bought a world called mob morph from Minecraft Mobile

If I make a room with this, it won't be made, but after about a minute, the Minecraft program stops...

I bought it with money, but what's wrong with it?

Please answer me

Even if I try the PC version, it stops and I can't make a room