Troubleshooting is fastest when you verify the basics in a fixed order. Start with the game and loader versions, then the active mods folder, then the rest of the mod list.
The game closes during startup
Confirm that you launched Minecraft 1.21.1 through NeoForge 21.1.65 or newer. A JAR built for a different loader or game version can fail before the main menu.
The mod does not appear
Check that the file is in the mods folder used by the profile you actually launched. Multiple launchers or instances can each have different game directories.
A large pack crashes but a clean profile works
Add other mods back in small groups. When the problem returns, narrow the group until you identify the conflict or version mismatch.
A world behaves strangely after removing the mod
Restore a backup if needed. Removing content mods can leave missing references or alter existing modded content, so testing changes on a copy is safer.
Ready to install Born in Chaos Mod 1.7.6?
Use the homepage download section to get the Minecraft 1.21.1 NeoForge JAR directly.
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