I bought a world called Festive Mash Up 2016. However whenever I try to create a new world for the Festive Mash up I get an error message saying "there was a problem loading this world".

The world I bought is called Festive Mash Up 2016. The error message I get is "There was a problem loading this world". All the rest of my paid worlds work whenever I try to create a new one.