LexForgeFix

LexForgeFix

Allow some mods for MinecraftForge 47.3.10+ run on NeoForge 47.1.x

by
234 Downloads
neoforgeutility
Rent Server with this Mod

About this Mod

MinecraftForge 1.20.1-47.3.10 introduced a new feature: allowing the mod entry class constructor to obtain an FMLJavaModLoadingContext as a parameter, whereas NeoForge 47.1.x at the same time did not support such a mod constructor.

This mod adds the classic parameterless constructor to these mods through bytecode modifications.

Fix these errors:

-- Head --
Thread: Render thread
Stacktrace:
	at net.minecraftforge.fml.javafmlmod.FMLModContainer.constructMod(FMLModContainer.java:109) ~[language-java-47.2.2.jar%23416!/:47.2] {}
-- MOD somemod --
Details:
	Mod File: <.minecraft>/mods/<somemod>-1.20.1-Forge.jar
	Failure message: Some Mod (somemod) has failed to load correctly
		java.lang.RuntimeException: Could not find mod constructor. Allowed optional argument classes: ModContainer, IEventBus, FMLModContainer
	Mod Version: 1.1.4514
	Mod Issue URL: https://example.com/
	Exception message: java.lang.RuntimeException: Could not find mod constructor. Allowed optional argument classes: ModContainer, IEventBus, FMLModContainer
Stacktrace:
	at net.minecraftforge.fml.javafmlmod.FMLModContainer.constructMod(FMLModContainer.java:109) ~[language-java-47.2.2.jar%23416!/:47.2] {}
	at net.minecraftforge.fml.ModContainer.lambda$buildTransitionHandler$10(ModContainer.java:123) ~[core-47.2.2.jar%23415!/:47.2] {re:mixin}
	at java.util.concurrent.CompletableFuture$AsyncRun.run(CompletableFuture.java:1804) ~[?:?] {}
	at java.util.concurrent.CompletableFuture$AsyncRun.exec(CompletableFuture.java:1796) ~[?:?] {}
	at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:387) ~[?:?] {}
	at java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1312) ~[?:?] {}
	at java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1843) ~[?:?] {re:mixin,re:computing_frames}
	at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1808) ~[?:?] {re:mixin,re:computing_frames}
	at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:188) ~[?:?] {re:mixin}
-- Head --
Thread: Render thread
Stacktrace:
	at java.lang.Class.getConstructor0(Class.java:3761) ~[?:?] {}
-- MOD somemod --
Details:
	Mod File: <.minecraft>/mods/<somemod>-1.20.1-Forge.jar
	Failure message: Some Mod (somemod) has failed to load correctly
		java.lang.NoSuchMethodException: com.example.SomeMod.<init>()
	Mod Version: 0.1.0
	Mod Issue URL: NOT PROVIDED
	Exception message: java.lang.NoSuchMethodException: com.example.SomeMod.<init>()
Stacktrace:
	at java.lang.Class.getConstructor0(Class.java:3761) ~[?:?] {}
	at java.lang.Class.getDeclaredConstructor(Class.java:2930) ~[?:?] {}
	at net.minecraftforge.fml.javafmlmod.FMLModContainer.constructMod(FMLModContainer.java:68) ~[javafmllanguage-1.20.1-47.1.3.jar%23181!/:?] {}
	at net.minecraftforge.fml.ModContainer.lambda$buildTransitionHandler$10(ModContainer.java:123) ~[fmlcore-1.20.1-47.1.3.jar%23180!/:?] {}
	at java.util.concurrent.CompletableFuture$AsyncRun.run(CompletableFuture.java:1804) ~[?:?] {}
	at java.util.concurrent.CompletableFuture$AsyncRun.exec(CompletableFuture.java:1796) ~[?:?] {}
	at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:387) ~[?:?] {}
	at java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1312) ~[?:?] {}
	at java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1843) ~[?:?] {}
	at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1808) ~[?:?] {}
	at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:188) ~[?:?] {}

Available Versions

LexForgeFix 0.1.1release
MC 1.20.1neoforge
January 7, 2026
LexForgeFix 0.1.0release
MC 1.20.1neoforge
January 6, 2026

How to Install LexForgeFix on Your Server

1

Order Server

Order a Minecraft Java server with at least 3 GB RAM (4 GB recommended).

2

Set neoforge Loader

In the panel under "Egg", select the neoforge loader and matching Minecraft version (1.20.1).

3

Install Mod

Open the mod browser in the dashboard and search for "LexForgeFix". Click "Install" – done! Alternatively, upload the .jar via SFTP to the /mods folder.

Compatibility

Mod Loaders

neoforge

Minecraft Versions

1.20.1

Server-side

Required

Recommended RAM

4 GB(min. 3 GB)

Frequently Asked Questions

LexForgeFix server crashes on startup – what to do?

Most common cause: wrong neoforge version or insufficient RAM. Check the server log (latest.log) for "OutOfMemoryError" or "Mixin" errors. With Mado Hosting: ensure at least 3 GB RAM is allocated and the loader matches the mod version (1.20.1). You can switch loaders with one click in the panel.

Is LexForgeFix compatible with neoforge?

LexForgeFix officially supports neoforge for Minecraft 1.20.1. The Mado dashboard automatically detects incompatible loader combinations.

Server lagging with LexForgeFix – how to optimize performance?

Recommended RAM: 4 GB (per 8 players). Use /spark profiler to check if LexForgeFix consumes the most tick time. Common fixes: reduce server view-distance to 8-10, install "performant" or "starlight" as supplementary mods on Forge. With Mado Hosting, your server runs on NVMe SSDs with dedicated CPU cores for minimal latency.

Rent Modded Server

Install LexForgeFix with just one click on your server.

Recommended RAM
4 GBab €8/mo
Min. 3 GB | +1 GB pro 8 Spieler
Create Server Now
1-Click Mod Install
NVMe SSD Storage
DDoS Protection included

Details

License
MIT License
Server-side
Required

Supported Versions

1.20.1