Unable to connect! Out-of-date client!

Hello!

I try to enter my world, but I get a screen that shows what the image I have attached (Unable to connect! Out-of-date client!)

I have looked in forums and this is common when a patch has been put recently, but I have two friends playing right now in the world, who come and go without any problem, and have also been in and out throughout the day.

I also get the option to redirect to the store and buy the game again, but it appears to me already bought in the library, so I don't know what happens.

Thanks!