Windows 10: Unable to connect to world

 HELP 

I started playng yesterday, and I'm trying to play with my friends.

Yesterday I played with them, but today I can't beacuse when I try to connect to the world there's an error:"Unable to connect to world"

I don't know how to resolve, on the internet there's not any answer, I tried to uninstall and reinstall the game but it didn't work.

Please resolve.