Affects Version/s: 1.0
Fix Version/s: None
You landed on this page because the game detected an error to start the game.
The issue occurred because the material library failed to load correctly.
To resolve this issue, please follow the steps listed below.
The most common case when this occurs, is when a mod tries to modify the material library in an incorrect way. If you are a modder and tried to modify the material library with your mod, check the material library modifications for possible issues.
If you are a user who is using a mod, please disable all mods and see if the startup error has been resolved. If that solved the issue, identify the problematic mod and contact the author of the mod for support.
If you ended up on this page and don't have any mods installed or if you believe that the issue is not related to any mod, send a mail to firstname.lastname@example.org (Subject: X4-452 - Exitcode 1021) with a screenshot of the popup error you got and the uidata.xml file which resides in the game's user directory.
If you didn't get a popup error but only got redirected to this page, try to start the game in windowed (or borderless mode) and see, if the popup window shows up now.
Prior to 3.20 Beta 2 Hotfix 1, players were 'incorrectly' redirected to X4-2 when this issue occurred (or not at all, if the game was running in fullscreen).