CHOCOLADEJUNKY

Hi.I recently made a 3.0.4 tekkit server ,configured it and then , when someone try to connect to it , it says End Of Stream ,and in the logs it says : Disconnecting <player's name> : Outdated client!. I thought we don't need to update our technic launchers .So ,what I need to do ? I use Windows 7 Ultimate x64 and Java 7 x64