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---- Minecraft Crash Report ----
// Don't be sad, have a hug! <3

Time: 13/01/15 07:20 PM
Description: Exception in server tick loop

cpw.mods.fml.common.LoaderException: java.lang.NoClassDefFoundError: net/minecraft/client/multiplayer/WorldClient
at cpw.mods.fml.common.LoadController.transition(LoadController.java:162)
at cpw.mods.fml.common.Loader.initializeMods(Loader.java:691)
at cpw.mods.fml.server.FMLServerHandler.finishServerLoading(FMLServerHandler.java:97)
at cpw.mods.fml.common.FMLCommonHandler.onServerStarted(FMLCommonHandler.java:318)
at net.minecraft.server.dedicated.DedicatedServer.func_71197_b(DedicatedServer.java:187)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:374)
at net.minecraft.server.MinecraftServer$2.run(MinecraftServer.java:670)
Caused by: java.lang.NoClassDefFoundError: net/minecraft/client/multiplayer/WorldClient
at DamageIndicatorsMod.server.DIProxy.register(DIProxy.java:26)
at DamageIndicatorsMod.DIMod.load(DIMod.java:97)
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.GeneratedMethodAccessor4.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:47)
at com.google.common.eventbus.EventBus.dispatch(EventBus.java:314)
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: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.EventHandler.handleEvent(EventHandler.java:74)
at com.google.common.eventbus.SynchronizedEventHandler.handleEvent(SynchronizedEventHandler.java:47)
at com.google.common.eventbus.EventBus.dispatch(EventBus.java:314)
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:118)
at cpw.mods.fml.common.Loader.initializeMods(Loader.java:690)
... 5 more
Caused by: java.lang.ClassNotFoundException: net.minecraft.client.multiplayer.WorldClient
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:99)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 33 more


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

-- System Details --
Details:
Minecraft Version: 1.7.2
Operating System: Windows 7 (amd64) version 6.1
Java Version: 1.7.0_71, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 251873568 bytes (240 MB) / 365953024 bytes (349 MB) up to 1372061696 bytes (1308 MB)
JVM Flags: 0 total;
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 v9.03 FML v7.2.217.1147 Minecraft Forge 10.12.2.1147 16 mods loaded, 16 mods active
mcp{9.03} [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized
FML{7.2.217.1147} [Forge Mod Loader] (minecraft_server.jar) Unloaded->Constructed->Pre-initialized->Initialized
Forge{10.12.2.1147} [Minecraft Forge] (minecraft_server.jar) Unloaded->Constructed->Pre-initialized->Initialized
CodeChickenCore{1.0.2.12} [CodeChicken Core] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized
NotEnoughItems{1.0.2.34} [Not Enough Items] (NotEnoughItems-1.7.2-1.0.2.34-universal.jar) Unloaded->Constructed->Pre-initialized->Initialized
DamageIndicatorsMod{3.1.2} [Damage Indicators] ([1.7.2]DamageIndicatorsMod-3.1.2.jar) Unloaded->Constructed->Pre-initialized->Errored
customnpcs{1.7.2-2} [CustomNpcs] (CustomNPCs_1.7.2.jar) Unloaded->Constructed->Pre-initialized->Initialized
DragonMounts{r37} [Dragon Mounts] (Dragon-Mounts-Mod-1.7.2.zip) Unloaded->Constructed->Pre-initialized->Initialized
guilib{1.0.7.0} [GUI Library] (Forge_GuiLibv1.0.7.0.zip) Unloaded->Constructed->Pre-initialized->Initialized
PaintingSelGui{1.7.2.0} [PaintingSelectionGui] (Forge_PaintingSelectionGuiv1.7.2.0.zip) Unloaded->Constructed->Pre-initialized->Initialized
ssHookShot{1.0} [?????????????] (Hook-Shot-Mod-1.7.2.jar) Unloaded->Constructed->Pre-initialized->Initialized
iChunUtil{3.3.0} [iChunUtil] (iChunUtil-3.3.0.jar) Unloaded->Constructed->Pre-initialized->Initialized
quiverchevsky{b56} [QuiverBow] (QuiverBow_1.7.2_b56.zip) Unloaded->Constructed->Pre-initialized->Initialized
SlimevoidLib{2.0.4.5} [Slimevoid Library] (SlimevoidLibrary-2.0.4.5.jar) Unloaded->Constructed->Pre-initialized->Initialized
stillhungry{1.7.2-2.1.0} [Still Hungry!] (stillhungry-1.7.2-2.1.1.jar) Unloaded->Constructed->Pre-initialized->Initialized
Sync{3.0.1} [Sync] (Sync-3.0.1.jar) Unloaded->Constructed->Pre-initialized->Initialized
Profiler Position: N/A (disabled)
Is Modded: Definitely; Server brand changed to 'fml,forge'
Type: Dedicated Server (map_server.txt)

DamageIndicatorsMod{3.1.2} [Damage Indicators] ([1.7.2]DamageIndicatorsMod-3.1.2.jar) Unloaded->Constructed->Pre-initialized->Errored

If that is a server, you can't put client only mod on it.