Hi,
I created a modpack for my friends and got a few errors. I have fixed all of them and after updateing a few mods I get this error on my server.

---- Minecraft Crash Report ----
// But it works on my machine.

Time: 22.06.16 15:32
Description: Exception in server tick loop

cpw.mods.fml.common.LoaderException: java.lang.NoClassDefFoundError: net/minecraft/client/entity/EntityClientPlayerMP
at cpw.mods.fml.common.LoadController.transition(LoadController.java:163)
at cpw.mods.fml.common.Loader.initializeMods(Loader.java:744)
at cpw.mods.fml.server.FMLServerHandler.finishServerLoading(FMLServerHandler.java:97)
at cpw.mods.fml.common.FMLCommonHandler.onServerStarted(FMLCommonHandler.java:319)
at net.minecraft.server.dedicated.DedicatedServer.func_71197_b(DedicatedServer.java:210)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:387)
at net.minecraft.server.MinecraftServer$2.run(MinecraftServer.java:685)
Caused by: java.lang.NoClassDefFoundError: net/minecraft/client/entity/EntityClientPlayerMP
at crazypants.enderio.EnderIO.onImc(EnderIO.java:668)
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:532)
at sun.reflect.GeneratedMethodAccessor3.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:212)
at cpw.mods.fml.common.LoadController.propogateStateMessage(LoadController.java:190)
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:297)
at cpw.mods.fml.common.Loader.initializeMods(Loader.java:740)
... 5 more
Caused by: java.lang.ClassNotFoundException: net.minecraft.client.entity.EntityClientPlayerMP
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:191)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 32 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 7 (amd64) version 6.1
Java Version: 1.8.0_91, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 1157173040 bytes (1103 MB) / 1782054912 bytes (1699 MB) up to 2863661056 bytes (2731 MB)
JVM Flags: 2 total; -Xms1G -Xmx3G
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 v7.10.99.99 Minecraft Forge 10.13.4.1614 30 mods loaded, 30 mods active
States: 'U' = Unloaded 'L' = Loaded 'C' = Constructed 'H' = Pre-initialized 'I' = Initialized 'J' = Post-initialized 'A' = Available 'D' = Disabled 'E' = Errored
UCHIJ mcp{9.05} Minecraft Coder Pack
UCHIJ FML{7.10.99.99} Forge Mod Loader
UCHIJ Forge{10.13.4.1614} Minecraft Forge
UCHIJ appliedenergistics2-core{rv2-stable-10} AppliedEnergistics2 Core
UCHIJ {000} CoFH ASM
UCHIJ {0} DragonAPI ASM Data Initialization
UCHIJ CoFHCore{1.7.10R3.0.3} CoFH Core
UCHIJ advancedgenetics{1.5.8} Advanced Genetics
UCHIJ appliedenergistics2{rv2-stable-10} Applied Energistics 2
UCHIJ BigReactors{0.4.3A} Big Reactors
UCHIJ BuildCraft|Core{7.0.17} BuildCraft
UCHIJ BuildCraft|Factory{7.0.17} BC Factory
UCHIJ BuildCraft|Energy{7.0.17} BC Energy
UCHIJ BuildCraft|Silicon{7.0.17} BC Silicon
UCHIJ BuildCraft|Builders{7.0.17} BC Builders
UCHIJ BuildCraft|Robotics{7.0.17} BC Robotics
UCHIJ BuildCraft|Transport{7.0.17} BC Transport
UCHIJ Baubles{1.0.1.10} Baubles
UCHIJ Thaumcraft{4.2.3.5} Thaumcraft
UCHIJ chisel{2.5.1.44} Chisel 2
UCHIJ DragonAPI{1.0} [DragonAPI](DragonAPI 1.7.10 V15a.jar)
UCHIJ ChromatiCraft{1.0} [ChromatiCraft](ChromatiCraft 1.7.10 V15a.jar)
UCHIE EnderIO{1.7.10-2.2.6.316} Ender IO
UCHIJ ExtraUtilities{1.2.12} Extra Utilities
UCHIJ ImmersiveEngineering{0.7.7} Immersive Engineering
UCHIJ MetallurgyCore{4.0.4} Metallurgy Core
UCHIJ Metallurgy{4.0.6} Metallurgy 4
UCHIJ harvestcraft{1.7.10j} [Pam's HarvestCraft](Pam's HarvestCraft 1.7.10Lb.jar)
UCHIJ PneumaticCraft{1.9.15-104} PneumaticCraft
UCHIJ RotaryCraft{1.0} [RotaryCraft](RotaryCraft 1.7.10 V15a.jar)
CoFHCore: -[1.7.10]3.0.3-303
AE2 Version: stable rv2-stable-10 for Forge 10.13.2.1291
AE2 Integration: IC2:OFF, RotaryCraft:ON, RC:OFF, BC:ON, RF:ON, RFItem:ON, MFR:OFF, DSU:ON, FZ:OFF, FMP:OFF, RB:OFF, CLApi:OFF, Waila:OFF, Mekanism:OFF, ImmibisMicroblocks:OFF, BetterStorage:OFF
Profiler Position: N/A (disabled)
Is Modded: Definitely; Server brand changed to 'fml,forge'
Type: Dedicated Server (map_server.txt)

see #3298