Minecraft Forums

Here is the crash report:

---- Minecraft Crash Report ----
// Hi. I'm Minecraft, and I'm a crashaholic.

Time: 5/23/15 9:26 PM
Description: There was a severe problem during mod loading that has caused the game to fail

cpw.mods.fml.common.LoaderException: java.lang.NoClassDefFoundError: net/minecraftforge/common/EnumHelper
at cpw.mods.fml.common.LoadController.transition(LoadController.java:163)
at cpw.mods.fml.common.Loader.loadMods(Loader.java:522)
at cpw.mods.fml.client.FMLClientHandler.beginMinecraftLoading(FMLClientHandler.java:206)
at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:480)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:878)
at net.minecraft.client.main.Main.main(SourceFile:148)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)
at net.minecraft.launchwrapper.Launch.main(Launch.java:28)
Caused by: java.lang.NoClassDefFoundError: net/minecraftforge/common/EnumHelper
at skateboardbaseclass.SkateboardBaseClass.<clinit>(SkateboardBaseClass.java:152)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:344)
at cpw.mods.fml.common.FMLModContainer.constructMod(FMLModContainer.java:440)
at sun.reflect.GeneratedMethodAccessor3.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
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(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
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:119)
at cpw.mods.fml.common.Loader.loadMods(Loader.java:511)
... 10 more
Caused by: java.lang.ClassNotFoundException: net.minecraftforge.common.EnumHelper
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:191)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 35 more
Caused by: java.lang.NullPointerException
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:182)
... 37 more

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: 1.8.0_25, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 163820304 bytes (156 MB) / 303771648 bytes (289 MB) up to 1060372480 bytes (1011 MB)
JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M
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: Minecraft 1.7.10 MCP v9.05 FML v7.10.99.99 Minecraft Forge 10.13.3.1407 Optifine OptiFine_1.7.10_HD_B7 29 mods loaded, 29 mods active
mcp{9.05} [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed
FML{7.10.99.99} [Forge Mod Loader] (forge-1.7.10-10.13.3.1407-1.7.10.jar) Unloaded->Constructed
Forge{10.13.3.1407} [Minecraft Forge] (forge-1.7.10-10.13.3.1407-1.7.10.jar) Unloaded->Constructed
CodeChickenCore{1.0.4.29} [CodeChicken Core] (minecraft.jar) Unloaded->Constructed
ivtoolkit{IvToolkit} [1.1] (minecraft.jar) Unloaded->Constructed
NotEnoughItems{1.0.3.74} [Not Enough Items] (Not-Enough-Items-1.7.10.jar) Unloaded->Constructed
malisiscore{1.7.2-0.7.3} [Malisis Core] (malisiscore-1.7.2-0.7.3.jar) Unloaded->Constructed
carsanddrives{1.0.9} [Cars and Drives] (Cars_and_Drives_Mod_V-1.0.9.jar) Unloaded->Constructed
DamageIndicatorsMod{3.2.0} [Damage Indicators] (Damage-Indicators-Mod-1.7.10.jar) Unloaded->Constructed
Emotes{1.0} [Emotes] (Emotes-Mod-1.7.10.jar) Unloaded->Constructed
examplemod{1.0} [examplemod] (ExtraDoors-1.7.2-1.5.1.jar) Unloaded->Constructed
extradoors{1.5.1} [Extra Doors] (ExtraDoors-1.7.2-1.5.1.jar) Unloaded->Constructed
iChunUtil{4.2.2} [iChunUtil] (iChunUtil-4.2.2.jar) Unloaded->Constructed
instahouse{6.3} [Insta House] (Insta-House-Mod-1.7.10.jar) Unloaded->Constructed
InventoryPets{1.0.1} [Inventory Pets] (inventorypets-1.7.10-1.0.1.jar) Unloaded->Constructed
malisisdoors{1.7.2-0.8} [Malisis' Doors] (malisisdoors-1.7.2-0.8.jar) Unloaded->Constructed
radixcore{1.3.0} [RadixCore] (RadixCore-1.3.0 MC-1.7.x.zip) Unloaded->Constructed
mca{4.1.1} [Minecraft Comes Alive] (MCA-4.1.1 MC-1.7.10.zip) Unloaded->Constructed
mcheli{0.9.3} [MC Helicopter] (mcheli) Unloaded->Constructed
mfm{2.2.2} [Mo' Furnaces Mod] (mfm-1.7.10-2.2.2.jar) Unloaded->Constructed
cfm{3.4.7} [§9MrCrayfish's Furniture Mod] (MrCrayfishFurnitureModv3.4.7(1.7.10).jar) Unloaded->Constructed
pandorasbox{2.0.1} [Pandora's Box] (Pandoras-Box-Mod-1.7.10.jar) Unloaded->Constructed
securitycraft{v1.7.0} [SecurityCraft] (SecurityCraft-Mod-1.7.10.jar) Unloaded->Constructed
skateboardbaseclass{0.05 ALPHA} [Skateboard Mod] (Skateboard Mod alpha 0.05.zip) Unloaded->Errored
RainbowWorld{1.0.0} [RainbowWorld] (The-Rainbow-World-Mod-1.7.10.jar) Unloaded->Constructed
tntmod{1.7.10} [TNTmod] (TNT mod 3.2.jar) Unloaded->Constructed
TrailMix{4.0.0} [TrailMix] (TrailMix-4.0.0.jar) Unloaded->Constructed
WebDisplay{0.7} [Web Displays] (Web-Displays-Mod-1.7.10.jar) Unloaded->Constructed
WiiRemoteId{1.1} [WiiRemoteMod by Nether(Miko3335)] (WiiMod-1.7.10-1.1.jar) Unloaded->Constructed

If you can help me that would be great.