When I create a world and someone tries to tell them it is impossible to connect to the world, we have the same versions of minecraft, I activated multiplayer and it seems to me a disappointment that nobody can enter my worlds

We are unable to diagnose your issue due to the lack of proper debug information. Please review the guidelines before reporting issues.
In case of a game crash, please also attach the crash log from [minecraft/crash-reports/crash-<DATE>-client.txt|http://hopper.minecraft.net/help/finding-minecraft-data-folder].

-- I am a bot. This action was performed automagically!