Search the Forums BEFORE making a new post.

Modder Support

This is the support section for those modding with Forge. Help with modding goes in here, however, please keep in mind that this is not a Java school. You are expected to have basic knowledge of Java before posting here.

Followers

Documentation

24356745 visits to this link
ForgeGradle
ForgeGradle

Help and support setting up your IDE and building mods with Gradle.
- 5.5k posts
[MC 1.21.11] Build failed because plugin is not found

dagobertdu94, February 18Feb 18

Start new topic

Followers

IPS spam blocked by CleanTalk.

Announcements

Trouble setting up a 1.12.2 MDK in 2026

Hello,
I’m having trouble setting up the development environment in IntelliJ IDEA using the Minecraft Forge MDK version net.minecraftforge:forge:1.12.2-14.23.5.2864. I’m using Java 8.
I haven’t modified anything — I simply downloaded the MDK ZIP from the official Forge website, extracted it, and ran the Gradle setup commands. Minecraft launches for a few seconds and then crashes with some unusual errors:

Caused by: java.lang.IllegalArgumentException
Caused by: java.lang.NullPointerException
[Client thread/ERROR] [FML]: There was a problem reading the entry module-info.class in the jar C:\Users\tmh.gradle\caches\modules-2\files-2.1\org.ow2.asm\asm\6.2\1b6c4ff09ce03f3052429139c2a68e295cae6604\asm-6.2.jar - probably a corrupt zip net.minecraftforge.fml.common.LoaderException: java.lang.IllegalArgumentException
at net.minecraftforge.fml.common.discovery.asm.ASMModParser.<init>(ASMModParser.java:63) ~[ASMModParser.class:?]

For some reason, it appears to be attempting to load several Gradle .jar files as Minecraft mods, and it does this with quite a large number of jars.
I haven’t changed the build.gradle file at all — everything is still using the default configuration — so I’m not sure why it’s trying to load them as mods.

By tressamalcolm · 2 hours ago2 hr
Horror with the guys

i want to play with my friends plz

By Maddyzzz · 6 hours ago6 hr
Best modded minecraft server hosting 2026

Have you tried Lagless.gg? I saw an ad for free trials and after messing around a bit it seems nice

By sly555 · Tuesday at 10:23 PM1 day
Trying to add Sculk Horde to Raspberry Flavored (java.lang.NoClassDefFoundError)

Hey there! I've been trying to add Sculk Horde to Raspberry Flavored. AzureLib works just fine minus Sculk Horde but whenever I add it I get the message:
"Sculk Horde (sculkhorde) has failed to load correctly
java.lang.NoClassDefFoundError: mod/azure/azurelib/animatable/GeoEntity"

Please let me know if there's anything I can do to troubleshoot! Or if it's not possible just gear me up to rip that bandaid off, thanks in advance!

Here's the pastebin for the latest crash:
https://pastebin.com/b4XJCTQq

By Eisean · Tuesday at 09:24 PM1 day
[1.8] Any way to make vanilla dirt a falling block?

Wanted to add onto this for anyone else who finds it.

GameRegistry.addSubstitutionAlias works, but if you are replacing a block, you need to replace both the block and the block item.
// removed everything but the relevant code public static Block newBlock= new FallingBlockDirt(); // needs to extend Dirt Block... @EventHandler public void preInit(FMLPreInitializationEvent event ) { GameRegistry.addSubstitutionAlias( "block.id.to.replace", GameRegistry.Type.BLOCK, newBlock); GameRegistry.addSubstitutionAlias( "block.id.to.replace", GameRegistry.Type.ITEM, new ItemBlock(newBlock)); }In the case of the op, I think he was missing this second substitute alias. As the error he mentioned is similar to what I saw in that scenario.

He would need to make a class that extends Block Dirt ( what he's replacing ), but overwrite some methods with those of BlockFalling ( what gravel uses ).
If he tried to use the BlockFalling class, or a new class that extends that... that would also fail as it doesn't match 1-1 what the BlockDirt was expecting.

In my case, I was using 1.7.10, so there may be slight differences that I haven't noticed.

Edit: Forgot to mention. Don't register the new block. The addSubsitutionAlias is splicing the new one in for the old one, so it shouldn't have a new registry.

By rockGiant · Tuesday at 04:27 PM1 day

harrisonolivia

Subforums

47608 topics in this forum

Important Information

Configure browser push notifications

Chrome (Android)

Chrome (Desktop)

Safari (iOS 16.4+)

Safari (macOS)

Edge (Android)

Edge (Desktop)

Firefox (Android)

Firefox (Desktop)