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Basically,I wanted to download mods and so I got forge and everything went smoothly but not until I tried to play a single player world.I created it a after it said "Loading" It crashed.I really want to download a mod so can someone tell me how to fix this problem? Must my mod be in Java because it is in Winrar as I could not download Java but I don't think thats the problem.

Heres my crash report

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

Time: 6/27/16 4:06 PM
Description: Unexpected error

java.lang.NoSuchMethodError: net.minecraft.server.MinecraftServer.func_71203_ab()Lnet/minecraft/server/management/ServerConfigurationManager;
at com.sk89q.worldedit.forge.ThreadSafeCache.tickStart(ThreadSafeCache.java:61)
at net.minecraftforge.fml.common.eventhandler.ASMEventHandler_6_ThreadSafeCache_tickStart_TickEvent.invoke(.dynamic)
at net.minecraftforge.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:49)
at net.minecraftforge.fml.common.eventhandler.EventBus.post(EventBus.java:140)
at net.minecraftforge.fml.common.FMLCommonHandler.onPostClientTick(FMLCommonHandler.java:337)
at net.minecraft.client.Minecraft.func_71407_l(Minecraft.java:1850)
at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:1056)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:369)
at net.minecraft.client.main.Main.main(SourceFile:124)
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)

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

-- System Details --
Details:
Minecraft Version: 1.9.4
Operating System: Windows 10 (amd64) version 10.0
Java Version: 1.8.0_25, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 311128008 bytes (296 MB) / 605851648 bytes (577 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
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
FML: MCP 9.28 Powered by Forge 12.17.0.1976 4 mods loaded, 4 mods active
States: 'U' = Unloaded 'L' = Loaded 'C' = Constructed 'H' = Pre-initialized 'I' = Initialized 'J' = Post-initialized 'A' = Available 'D' = Disabled 'E' = Errored
UCHIJAAA mcp{9.19} [Minecraft Coder Pack] (minecraft.jar)
UCHIJAAA FML{8.0.99.99} [Forge Mod Loader] (forge-1.9.4-12.17.0.1976.jar)
UCHIJAAA Forge{12.17.0.1976} [Minecraft Forge] (forge-1.9.4-12.17.0.1976.jar)
UCHIJAEE worldedit{6.1.1} [WorldEdit] (worldedit-forge-mc1.8.9-6.1.1-dist.jar)
Loaded coremods (and transformers):
GL info: ' Vendor: 'ATI Technologies Inc.' Version: '4.5.13399 Compatibility Profile Context 15.201.1151.1008' Renderer: 'AMD Radeon HD 7600M Series'
Launched Version: 1.9.4-forge1.9.4-12.17.0.1976
LWJGL: 2.9.4
OpenGL: AMD Radeon HD 7600M Series GL version 4.5.13399 Compatibility Profile Context 15.201.1151.1008, ATI Technologies Inc.
GL Caps: Using GL 1.3 multitexturing.
Using GL 1.3 texture combiners.
Using framebuffer objects because OpenGL 3.0 is supported and separate blending is supported.
Shaders are available because OpenGL 2.1 is supported.
VBOs are available because OpenGL 1.5 is supported.

Using VBOs: Yes
Is Modded: Definitely; Client brand changed to 'fml,forge'
Type: Client (map_client.txt)
Resource Packs: Faithful 32 PVP [1.9]
Current Language: English (US)
Profiler Position: N/A (disabled)