Something kinda bad happened

I was gonna play marketplace created game I’ve been playing for a day or two, but when I tried to play it it said “ there was a problem loading this world.” I was confused so I turned off the software and entered it back again and it still wouldn’t work. Then I realized all the marketplace created content I’ve been playing won’t work! For some reason. Also can you add bees  to my  Version of Minecraft? And foxes? Please?