You're probably here because you can not join your exaroton server which has a modpack installed because of the error message "ID XXXX mismatch between world and game" or similar error messages.
This problem could be caused by your operating system (e.g. Windows) and the language that it is set to.
Right now we are aware that this problem occurs with computers that use the Turkish language. ***
There are two ways to fix that problem:
We recommend the first as it has less impact on the rest of the computer. But if it does not work for you or the modpack launcher you're using does not support adding additional Java parameters you have to try the second option.
Add additional Java parameters to your launcher
What you do by adding the Java parameters is to tell Java to use another default language.
Here are some tutorials for some launchers to add these parameters.
Minecraft Vanilla Launcher:
1) Open the Minecraft Vanilla Launcher and switch to the "Installations" tab. Click the profile for your modpack and select "MORE OPTIONS". Add " -Duser.language=en -Duser.country=US" to the end of "JVM arguments". (Please note the space at the beginning of the string, it is required)
At the end click the save button and start your game.
Technic Launcher:
Open the Technic Launcher and click the "Launcher Options" Button in the upper right corner. In the new window click on the "Java Settings" Tab and enter "-Duser.language=en -Duser.country=US" into the Java Args field.
At the end click the close button of the Launcher Options window and start your game.
ATLauncher:
Open the ATLauncher and open the Settings tab on the left side. Enter "-Duser.language=en -Duser.country=US" into the Java Parameters field.
At the end click the save button and start your game.
Legacy Feed The Beast Launcher:
Open the Feed The Beast Launcher and click the "Options" Button in the upper menu, then click the "Advanced Options" Button.
Now enter "-Duser.language=en -Duser.country=US" into the Additional Java Parameters field.
At the end click the Exit button and start your game.
Change the operating system language
Here is a tutorial on how to change the windows system language on Windows 8 and newer: https://www.wikihow.com/Change-System-Language-on-Windows
Please note that this change updates the language for your entire computer and may also cause several other programs on your computer to use a different language.
*** If you have the same problem and the fix described above works for you please contact us and we'll update this article accordingly.