If you are encountering an error in RPG-X that is kicking you off a server or stopping you from joining a server and returning you to the main menu, please follow this guide to identify the problem you're experiencing.
To find the error, press the `/~ key which is to the left of the 1 key and/or above the tab key. This will open the console. Scroll up with PageUp/PageDown or the mousewheel until you see
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YOUR ERROR HERE
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Once you have that, post that information in a new thread and we will do our best to help. Saying that you were kicked back to the main menu is not enough for us to diagnose your problem.
Alternatively, you can type /condump <name>.txt to create a console dump in your RPG-XUE folder (either in BaseEF or RPG-X2, be sure to give it a memorable name) and paste the entire thing into your thread.