forgematica Patch Mod
Forgematica Patch for NeoForge 21.1.235 Fixes IllegalAccessError caused by private access to BufferBuilder.building.
- Loaders
- NeoForge
- Downloads on Modrinth
- 3.1K
- Followers on Modrinth
- 1
- version
- 1
- Updated
- July 11, 2026Jul 11
- Published
- in 2026
At a glance
Install in the game only; not needed on the server
Forgematica Patch
This mod restores compatibility between Forgematica 0.4.2 and NeoForge 21.1.235.
Without this patch, loading a schematic causes Forgematica to crash with an IllegalAccessError caused by access to the private BufferBuilder.building field.
The patch uses a small Mixin compatibility layer without modifying Forgematica itself.
Requirements
- Minecraft 1.21.1
- NeoForge 21.1.235
- Forgematica 0.4.2
- MaFgLib 0.4.3
Problem
Without this patch, loading a schematic causes Forgematica to crash with:
java.lang.IllegalAccessError:
class fi.dy.masa.litematica.render.schematic.BufferBuilderCache tried to access private field
com.mojang.blaze3d.vertex.BufferBuilder.buildingThis patch resolves the compatibility issue on NeoForge 21.1.235.
Solution
This patch restores compatibility between Forgematica 0.4.2 and NeoForge 21.1.235.
Notes
This is a compatibility patch only.
It does not add new features or change Forgematica's functionality.
It does not modify any Forgematica files.
It can be removed at any time without affecting your worlds or schematics.
FAQ
How to install forgematica Patch Mod?
Install NeoForge for your Minecraft version, download forgematica Patch Mod for the same version and loader, put the file into the mods folder and launch the game with the loader profile.
Which Minecraft versions does forgematica Patch Mod support?
forgematica Patch Mod has builds for Minecraft 1.21.1.
Is forgematica Patch Mod needed on the server?
Client only — no need to install it on the server