In 1.10 you need to download the world template for market place worlds you already created for a "add-on update" even if the world doesn't use addons or resourse packs
How to reproduce:
Download a market place world template
Create the world
leave the world
go to settings
go to storage
Locate the world template
delete it
go back to the world screen
try to go in the world
Youll get the message in the image
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