Crashing on server startup on latest forge (14.21.0.2375) (MC 1.12)

[davidreis97]

Crash report:

---- Minecraft Crash Report ----
// Don't do that.

Time: 6/27/17 5:08 PM
Description: Exception in server tick loop

net.minecraftforge.fml.common.LoaderExceptionModCrash: Caught exception from Wearable Backpacks (wearablebackpacks)
Caused by: java.lang.NoSuchMethodError: net.mcft.copy.backpacks.item.ItemBackpack.setRegistryName(Ljava/lang/String;)Lnet/minecraftforge/fml/common/registry/IForgeRegistryEntry;
    at net.mcft.copy.backpacks.BackpacksContent.init(BackpacksContent.java:30)
    at net.mcft.copy.backpacks.WearableBackpacks.preInit(WearableBackpacks.java:46)
    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.minecraftforge.fml.common.FMLModContainer.handleModStateEvent(FMLModContainer.java:647)
    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.Subscriber.invokeSubscriberMethod(Subscriber.java:91)
    at com.google.common.eventbus.Subscriber$SynchronizedSubscriber.invokeSubscriberMethod(Subscriber.java:150)
    at com.google.common.eventbus.Subscriber$1.run(Subscriber.java:76)
    at com.google.common.util.concurrent.MoreExecutors$DirectExecutor.execute(MoreExecutors.java:399)
    at com.google.common.eventbus.Subscriber.dispatchEvent(Subscriber.java:71)
    at com.google.common.eventbus.Dispatcher$PerThreadQueuedDispatcher.dispatch(Dispatcher.java:116)
    at com.google.common.eventbus.EventBus.post(EventBus.java:217)
    at net.minecraftforge.fml.common.LoadController.sendEventToModContainer(LoadController.java:252)
    at net.minecraftforge.fml.common.LoadController.propogateStateMessage(LoadController.java:230)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at com.google.common.eventbus.Subscriber.invokeSubscriberMethod(Subscriber.java:91)
    at com.google.common.eventbus.Subscriber$SynchronizedSubscriber.invokeSubscriberMethod(Subscriber.java:150)
    at com.google.common.eventbus.Subscriber$1.run(Subscriber.java:76)
    at com.google.common.util.concurrent.MoreExecutors$DirectExecutor.execute(MoreExecutors.java:399)
    at com.google.common.eventbus.Subscriber.dispatchEvent(Subscriber.java:71)
    at com.google.common.eventbus.Dispatcher$PerThreadQueuedDispatcher.dispatch(Dispatcher.java:116)
    at com.google.common.eventbus.EventBus.post(EventBus.java:217)
    at net.minecraftforge.fml.common.LoadController.distributeStateMessage(LoadController.java:147)
    at net.minecraftforge.fml.common.Loader.preinitializeMods(Loader.java:615)
    at net.minecraftforge.fml.server.FMLServerHandler.beginServerLoading(FMLServerHandler.java:98)
    at net.minecraftforge.fml.common.FMLCommonHandler.onServerStart(FMLCommonHandler.java:335)
    at net.minecraft.server.dedicated.DedicatedServer.func_71197_b(DedicatedServer.java:122)
    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:483)
    at java.lang.Thread.run(Unknown Source)

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

-- System Details --
Details:
    Minecraft Version: 1.12
    Operating System: Windows 10 (amd64) version 10.0
    Java Version: 1.8.0_77, Oracle Corporation
    Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
    Memory: 736234760 bytes (702 MB) / 896008192 bytes (854 MB) up to 3763863552 bytes (3589 MB)
    JVM Flags: 0 total; 
    IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
    FML: MCP 9.40 Powered by Forge 14.21.0.2375 5 mods loaded, 5 mods active
    States: 'U' = Unloaded 'L' = Loaded 'C' = Constructed 'H' = Pre-initialized 'I' = Initialized 'J' = Post-initialized 'A' = Available 'D' = Disabled 'E' = Errored
    UCH minecraft{1.12} [Minecraft] (minecraft.jar) 
    UCH mcp{9.19} [Minecraft Coder Pack] (minecraft.jar) 
    UCH FML{8.0.99.99} [Forge Mod Loader] (forge-1.12-14.21.0.2375-universal.jar) 
    UCH forge{14.21.0.2375} [Minecraft Forge] (forge-1.12-14.21.0.2375-universal.jar) 
    UCE wearablebackpacks{3.0.2} [Wearable Backpacks] (WearableBackpacks-1.12-3.0.2.jar) 
    Loaded coremods (and transformers): 
    Profiler Position: N/A (disabled)
    Is Modded: Definitely; Server brand changed to 'fml,forge'
    Type: Dedicated Server (map_server.txt)

[copygirl]

I need to update WB to the newer Forge versions. Unfortunately right now my build process is a bit broken due to one of the maven servers I depend on being down. I might try to compile it without InvTweaks support for now.

[copygirl]

Fixed in e023bf38f2fc2f8813ea1442c6ce77cf5c73400f. Will close issue once the next release is out.

[copygirl]

Here we go!