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Error: java.lang.NoClassDefFoundError: net/minecraftforge/client/model/data/IModelData

Posted July 31, 20223 yr

Anyone know how to repair Error named in Title?

Forge: 41.1.0

Mods: Biomes O' Plenty 17.0.0.143

Guard Villagers 1.5.1

TownsAndTowers 1.8.1

Xaero's Minimap 22.12.0

Optifine HD U H8

Quote

July 31, 20223 yr

The OptiFine version you are using is not compatible with the Forge version you are using.
Download a compatible one or remove OptiFine.

If the error still remains please post debug.log from the logs folder.

Edited July 31, 20223 yr by Luis_ST

Quote

July 31, 20223 yr

Author

It works but it's laggy as hell.

(Actually repaired it by removing resourcepack)

Edited July 31, 20223 yr by Faipht

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Bad pathfinding for big mobs (1.21.1)

Well I was mainly trying to figure out whether or not I was doing something wrong and if it could be fixed by just adding something (e.g. maybe I was missing an Attribute or something like that), but if that's not the case then my only option is to use custom pathfinding. If someone has one that functions and is willing to share it, then I'd gladly use that instead of suffering through making my own.

By VictorEvers · 10 hours ago10 hr
how do i change my username with forge?

In the future I do plan on adding optional OAuth to the new launcher in ForgeGradle 7. But yes, using --username and offline mode is a good workaround to not using accounts in the development environment, especially considering that the server is on LAN.

By Jonathing · 11 hours ago11 hr
how do i change my username with forge?

I came across this post looking for an answer to the OP's question. My use case is a classroom with one server in LAN and many clients of course participants that want to test their mods.

The answer is:
On the client
Edit build.gradle. In the section client add the following line before the closing curly brace: args '--username', '<YOUR NAME>'. Replace <YOUR NAME> with your actual username. E.g. if your username is lmoellendorf the client section should look like this:

client { // Comma-separated list of namespaces to load gametests from. Empty = all namespaces. property 'forge.enabledGameTestNamespaces', mod_id args '--username', 'lmoellendorf' }
Make sure that each username is unique on your server.

Start your Minecraft Client. Click Multiplayer then Direct Conection. Here enter the Server address which is the local IP of your server followed by colon : followed by the default port 25565. E.g. if your server's IP is 192.168.0.7 the entry should look like this:

192.168.0.7:25565
On the server

Be sure that in run/server.properties the line online-mode is set to false:

online-mode=false

By lmoellendorf · 11 hours ago11 hr
Forge 59.0 Minecraft 1.21.9

By Jonathing · Posted Thursday at 01:09 AM2 days
Forge 58.1 Minecraft 1.21.8

By Jonathing · Posted Thursday at 01:08 AM2 days

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Error: java.lang.NoClassDefFoundError: net/minecraftforge/client/model/data/IModelData

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Bad pathfinding for big mobs (1.21.1)

how do i change my username with forge?

how do i change my username with forge?

Forge 59.0 Minecraft 1.21.9

Forge 58.1 Minecraft 1.21.8

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