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Forging a Minecraft mod

Basic Minecraft modding with Minecraft Forge

1. Getting started

Crash

  • 2013-09-02 04:12:46
    I get this when i try to run the client after doing everything in the first part of the lecture

    --- Minecraft Crash Report ----
    // Shall we play a game?

    Time: 9/1/13 11:01 PM
    Description: There was a severe problem during mod loading that has caused the game to fail

    cpw.mods.fml.common.LoaderException: java.lang.ClassNotFoundException: Alpha64.proxy.ClientProxy
        at cpw.mods.fml.common.ProxyInjector.inject(ProxyInjector.java:75)
        at cpw.mods.fml.common.FMLModContainer.constructMod(FMLModContainer.java:519)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
        at java.lang.reflect.Method.invoke(Unknown Source)
        at com.google.common.eventbus.EventHandler.handleEvent(EventHandler.java:74)
        at com.google.common.eventbus.SynchronizedEventHandler.handleEvent(SynchronizedEventHandler.java:45)
        at com.google.common.eventbus.EventBus.dispatch(EventBus.java:313)
        at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:296)
        at com.google.common.eventbus.EventBus.post(EventBus.java:267)
        at cpw.mods.fml.common.LoadController.sendEventToModContainer(LoadController.java:194)
        at cpw.mods.fml.common.LoadController.propogateStateMessage(LoadController.java:174)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
        at java.lang.reflect.Method.invoke(Unknown Source)
        at com.google.common.eventbus.EventHandler.handleEvent(EventHandler.java:74)
        at com.google.common.eventbus.SynchronizedEventHandler.handleEvent(SynchronizedEventHandler.java:45)
        at com.google.common.eventbus.EventBus.dispatch(EventBus.java:313)
        at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:296)
        at com.google.common.eventbus.EventBus.post(EventBus.java:267)
        at cpw.mods.fml.common.LoadController.distributeStateMessage(LoadController.java:105)
        at cpw.mods.fml.common.Loader.loadMods(Loader.java:509)
        at cpw.mods.fml.client.FMLClientHandler.beginMinecraftLoading(FMLClientHandler.java:181)
        at net.minecraft.client.Minecraft.startGame(Minecraft.java:470)
        at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:796)
        at net.minecraft.client.main.Main.main(Main.java:93)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
        at java.lang.reflect.Method.invoke(Unknown Source)
        at net.minecraft.launchwrapper.Launch.launch(Launch.java:57)
        at net.minecraft.launchwrapper.Launch.main(Launch.java:18)
    Caused by: java.lang.ClassNotFoundException: Alpha64.proxy.ClientProxy
        at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:179)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        at cpw.mods.fml.common.ModClassLoader.loadClass(ModClassLoader.java:58)
        at java.lang.Class.forName0(Native Method)
        at java.lang.Class.forName(Unknown Source)
        at cpw.mods.fml.common.ProxyInjector.inject(ProxyInjector.java:58)
        ... 33 more
    Caused by: java.lang.NullPointerException
        at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:171)
        ... 39 more


    A detailed walkthrough of the error, its code path and all known details is as follows:
    ---------------------------------------------------------------------------------------

    -- System Details --
    Details:
        Minecraft Version: 1.6.2
        Operating System: Windows 7 (amd64) version 6.1
        Java Version: 1.7.0_15, Oracle Corporation
        Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
        Memory: 783433528 bytes (747 MB) / 1038876672 bytes (990 MB) up to 1038876672 bytes (990 MB)
        JVM Flags: 3 total; -Xincgc -Xmx1024M -Xms1024M
        AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
        Suspicious classes: FML and Forge are installed
        IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
        FML: MCP v8.04 FML v6.2.57.845 Minecraft Forge 9.10.0.845 4 mods loaded, 4 mods active
        mcp{8.04} [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed
        FML{6.2.57.845} [Forge Mod Loader] (bin) Unloaded->Constructed
        Forge{9.10.0.845} [Minecraft Forge] (bin) Unloaded->Constructed
        First{0.01} [IDK] (bin) Unloaded->Errored
  • 2013-09-02 07:58:54
    you might have messed up the path of your ClientProxy
  • 2013-09-02 09:28:44
    I'm pretty sure that that's the case. Make sure that the ClientProxy is put in the same packet you're referring to from your mod file.
  • 2013-09-02 19:22:34
    Thank you i see where the issue was now it is running and i can continue with your lectures
  • 2014-02-02 07:55:16
    I'm now having the same error as you had there, do you want to explain what you did to fix it?
  • 2014-02-02 10:15:34
    You need to make sure that the ClientProxy.java is in the same packets as you are referring to.
    For example if you have this:
        @SidedProxy(clientSide = "example.proxy.ClientProxy", serverSide = "example.proxy.CommonProxy")
        public static CommonProxy proxy;
    then you need to have your ClientProxy.java in the example.proxy package.
  • 2017-06-09 02:02:42
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