NoClassDefFoundError on a new Pixelmon Server?

Question

I'm trying to make a Pixelmon server, I followed the instructions of this video but it won't start:

Its a Cauldron server. Any idea what is going wrong? I am using:

Pixelmon: 3.4,
Minecraft: 1.7.10 ,
Cauldron: cauldron-1.7.10-1.1207.01.198
OS: Windows 8.1 (amd64) version 6.3
Java: 1.7.0_71

Thanks in advance!

---- Minecraft Crash Report ----
// Oh - I know what I did wrong!

Time: 2/21/15 12:33 PM
Description: Exception in server tick loop

cpw.mods.fml.common.LoaderException: java.lang.NoClassDefFoundError: net/minecraftforge/event/world/BlockEvent$PlaceEvent
    at cpw.mods.fml.common.LoadController.transition(LoadController.java:162)
    at cpw.mods.fml.common.Loader.preinitializeMods(Loader.java:515)
    at cpw.mods.fml.server.FMLServerHandler.beginServerLoading(FMLServerHandler.java:88)
    at cpw.mods.fml.common.FMLCommonHandler.onServerStart(FMLCommonHandler.java:317)
    at net.minecraft.server.dedicated.DedicatedServer.func_71197_b(DedicatedServer.java:170)
    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:620)
    at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.NoClassDefFoundError: net/minecraftforge/event/world/BlockEvent$PlaceEvent
    at com.pixelmonmod.pixelmon.config.PixelmonItemsBlocks.load(PixelmonItemsBlocks.java:28)
    at com.pixelmonmod.pixelmon.config.PixelmonItems.load(PixelmonItems.java:221)
    at com.pixelmonmod.pixelmon.config.PixelmonConfig.loadConfig(PixelmonConfig.java:160)
    at com.pixelmonmod.pixelmon.Pixelmon.preInit(Pixelmon.java:105)
    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 cpw.mods.fml.common.FMLModContainer.handleModStateEvent(FMLModContainer.java:513)
    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.EventSubscriber.handleEvent(EventSubscriber.java:74)
    at com.google.common.eventbus.SynchronizedEventSubscriber.handleEvent(SynchronizedEventSubscriber.java:47)
    at com.google.common.eventbus.EventBus.dispatch(EventBus.java:322)
    at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:304)
    at com.google.common.eventbus.EventBus.post(EventBus.java:275)
    at cpw.mods.fml.common.LoadController.sendEventToModContainer(LoadController.java:208)
    at cpw.mods.fml.common.LoadController.propogateStateMessage(LoadController.java:187)
    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.EventSubscriber.handleEvent(EventSubscriber.java:74)
    at com.google.common.eventbus.SynchronizedEventSubscriber.handleEvent(SynchronizedEventSubscriber.java:47)
    at com.google.common.eventbus.EventBus.dispatch(EventBus.java:322)
    at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:304)
    at com.google.common.eventbus.EventBus.post(EventBus.java:275)
    at cpw.mods.fml.common.LoadController.distributeStateMessage(LoadController.java:118)
    at cpw.mods.fml.common.Loader.preinitializeMods(Loader.java:513)
    ... 5 more
Caused by: java.lang.ClassNotFoundException: net.minecraftforge.event.world.BlockEvent$PlaceEvent
    at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:188)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    ... 36 more
Caused by: java.lang.NullPointerException


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

-- System Details --
Details:
    Minecraft Version: 1.7.10
    Operating System: Windows 8.1 (amd64) version 6.3
    Java Version: 1.7.0_71, Oracle Corporation
    Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
    Memory: 135834656 bytes (129 MB) / 372768768 bytes (355 MB) up to 2796552192 bytes (2667 MB)
    JVM Flags: 1 total; -Xmx3000M
    AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
    IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
    FML: MCP v9.05 FML v7.10.25.1207 Minecraft Forge 10.13.0.1207 4 mods loaded, 4 mods active
    mcp{9.05} [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized
    FML{7.10.25.1207} [Forge Mod Loader] (cauldronserver.jar) Unloaded->Constructed->Pre-initialized
    Forge{10.13.0.1207} [Minecraft Forge] (cauldronserver.jar) Unloaded->Constructed->Pre-initialized
    pixelmon{3.4.0} [Pixelmon] (Pixelmon-1.7.10-3.4.0-universal.jar) Unloaded->Constructed->Errored
    Profiler Position: N/A (disabled)
    Is Modded: Definitely; Server brand changed to 'cauldron,craftbukkit,mcpc,fml,forge'
    Type: Dedicated Server (map_server.txt)

score 3 · Answer 1 · answered Mar 04 '15 at 18:58

From the Pixelmon wiki's installation guide (emphasis mine):

Pixelmon 3.4 runs on Minecraft version 1.7.10 with Forge version 10.13.0.1230 or later and Java 7 or 8.

From your logfile:

Forge{10.13.0.1207} [...]
pixelmon{3.4.0}

Your version of Forge is earlier than 10.13.0.1230, when Pixelmon 3.4.x requires that version or later. Starting over with the right version of Forge will fix this particular crash.

NoClassDefFoundError on a new Pixelmon Server?

1 Answers1