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2016-06-21 17:37:35,039 WARN Unable to instantiate org.fusesource.jansi.WindowsAnsiOutputStream
2016-06-21 17:37:35,040 WARN Unable to instantiate org.fusesource.jansi.WindowsAnsiOutputStream
[17:37:35] [main/INFO] [LaunchWrapper]: Loading tweak class name net.minecraftforge.fml.common.launcher.FMLTweaker
[17:37:35] [main/INFO] [LaunchWrapper]: Using primary tweak class name net.minecraftforge.fml.common.launcher.FMLTweaker
[17:37:35] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.common.launcher.FMLTweaker
[17:37:35] [main/INFO] [FML]: Forge Mod Loader version 11.15.1.1902 for Minecraft 1.8.9 loading
[17:37:35] [main/INFO] [FML]: Java is Java HotSpot(TM) 64-Bit Server VM, version 1.8.0_91, running on Windows 7:amd64:6.1, installed at C:\Program Files\Java\jre1.8.0_91
[17:37:35] [main/INFO] [STDERR]: [net.minecraftforge.fml.relauncher.FMLLaunchHandler:setupHome:99]: java.lang.NoClassDefFoundError: cpw/mods/fml/relauncher/IFMLLoadingPlugin
[17:37:35] [main/INFO] [STDERR]: [net.minecraftforge.fml.relauncher.FMLLaunchHandler:setupHome:99]: at java.lang.ClassLoader.defineClass1(Native Method)
[17:37:35] [main/INFO] [STDERR]: [net.minecraftforge.fml.relauncher.FMLLaunchHandler:setupHome:99]: at java.lang.ClassLoader.defineClass(Unknown Source)
[17:37:35] [main/INFO] [STDERR]: [net.minecraftforge.fml.relauncher.FMLLaunchHandler:setupHome:99]: at java.security.SecureClassLoader.defineClass(Unknown Source)
[17:37:35] [main/INFO] [STDERR]: [net.minecraftforge.fml.relauncher.FMLLaunchHandler:setupHome:99]: at java.net.URLClassLoader.defineClass(Unknown Source)
[17:37:35] [main/INFO] [STDERR]: [net.minecraftforge.fml.relauncher.FMLLaunchHandler:setupHome:99]: at java.net.URLClassLoader.access$100(Unknown Source)
[17:37:35] [main/INFO] [STDERR]: [net.minecraftforge.fml.relauncher.FMLLaunchHandler:setupHome:99]: at java.net.URLClassLoader$1.run(Unknown Source)
[17:37:35] [main/INFO] [STDERR]: [net.minecraftforge.fml.relauncher.FMLLaunchHandler:setupHome:99]: at java.net.URLClassLoader$1.run(Unknown Source)
[17:37:35] [main/INFO] [STDERR]: [net.minecraftforge.fml.relauncher.FMLLaunchHandler:setupHome:99]: at java.security.AccessController.doPrivileged(Native Method)
[17:37:35] [main/INFO] [STDERR]: [net.minecraftforge.fml.relauncher.FMLLaunchHandler:setupHome:99]: at java.net.URLClassLoader.findClass(Unknown Source)
[17:37:35] [main/INFO] [STDERR]: [net.minecraftforge.fml.relauncher.FMLLaunchHandler:setupHome:99]: at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:117)
[17:37:35] [main/INFO] [STDERR]: [net.minecraftforge.fml.relauncher.FMLLaunchHandler:setupHome:99]: at java.lang.ClassLoader.loadClass(Unknown Source)
[17:37:35] [main/INFO] [STDERR]: [net.minecraftforge.fml.relauncher.FMLLaunchHandler:setupHome:99]: at java.lang.ClassLoader.loadClass(Unknown Source)
[17:37:35] [main/INFO] [STDERR]: [net.minecraftforge.fml.relauncher.FMLLaunchHandler:setupHome:99]: at java.lang.Class.forName0(Native Method)
[17:37:35] [main/INFO] [STDERR]: [net.minecraftforge.fml.relauncher.FMLLaunchHandler:setupHome:99]: at java.lang.Class.forName(Unknown Source)
[17:37:35] [main/INFO] [STDERR]: [net.minecraftforge.fml.relauncher.FMLLaunchHandler:setupHome:99]: at net.minecraftforge.fml.relauncher.CoreModManager.loadCoreMod(CoreModManager.java:536)
[17:37:35] [main/INFO] [STDERR]: [net.minecraftforge.fml.relauncher.FMLLaunchHandler:setupHome:99]: at net.minecraftforge.fml.relauncher.CoreModManager.discoverCoreMods(CoreModManager.java:416)
[17:37:35] [main/INFO] [STDERR]: [net.minecraftforge.fml.relauncher.FMLLaunchHandler:setupHome:99]: at net.minecraftforge.fml.relauncher.CoreModManager.handleLaunch(CoreModManager.java:246)
[17:37:35] [main/INFO] [STDERR]: [net.minecraftforge.fml.relauncher.FMLLaunchHandler:setupHome:99]: at net.minecraftforge.fml.relauncher.FMLLaunchHandler.setupHome(FMLLaunchHandler.java:95)
[17:37:35] [main/INFO] [STDERR]: [net.minecraftforge.fml.relauncher.FMLLaunchHandler:setupHome:99]: at net.minecraftforge.fml.relauncher.FMLLaunchHandler.setupClient(FMLLaunchHandler.java:72)
[17:37:35] [main/INFO] [STDERR]: [net.minecraftforge.fml.relauncher.FMLLaunchHandler:setupHome:99]: at net.minecraftforge.fml.relauncher.FMLLaunchHandler.configureForClientLaunch(FMLLaunchHandler.java:34)
[17:37:35] [main/INFO] [STDERR]: [net.minecraftforge.fml.relauncher.FMLLaunchHandler:setupHome:99]: at net.minecraftforge.fml.common.launcher.FMLTweaker.injectIntoClassLoader(FMLTweaker.java:119)
[17:37:35] [main/INFO] [STDERR]: [net.minecraftforge.fml.relauncher.FMLLaunchHandler:setupHome:99]: at net.minecraft.launchwrapper.Launch.launch(Launch.java:115)
[17:37:35] [main/INFO] [STDERR]: [net.minecraftforge.fml.relauncher.FMLLaunchHandler:setupHome:99]: at net.minecraft.launchwrapper.Launch.main(Launch.java:28)
[17:37:35] [main/INFO] [STDERR]: [java.lang.Throwable:printStackTrace:-1]: Caused by: java.lang.ClassNotFoundException: cpw.mods.fml.relauncher.IFMLLoadingPlugin

[17:37:35] [main/INFO] [STDERR]: [java.lang.Throwable:printStackTrace:-1]: at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:191)
[17:37:35] [main/INFO] [STDERR]: [java.lang.Throwable:printStackTrace:-1]: at java.lang.ClassLoader.loadClass(Unknown Source)
[17:37:35] [main/INFO] [STDERR]: [java.lang.Throwable:printStackTrace:-1]: at java.lang.ClassLoader.loadClass(Unknown Source)
[17:37:35] [main/INFO] [STDERR]: [java.lang.Throwable:printStackTrace:-1]: ... 23 more
[17:37:35] [main/INFO] [STDERR]: [java.lang.Throwable:printStackTrace:-1]: Caused by: java.lang.NullPointerException
[17:37:35] [main/INFO] [STDERR]: [java.lang.Throwable:printStackTrace:-1]: at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:182)
[17:37:35] [main/INFO] [STDERR]: [java.lang.Throwable:printStackTrace:-1]: ... 25 more
[17:37:35] [main/ERROR] [FML]: An error occurred trying to configure the minecraft home at C:\Users\Kaiya\AppData\Roaming\.minecraft for Forge Mod Loader
java.lang.NoClassDefFoundError: cpw/mods/fml/relauncher/IFMLLoadingPlugin
at java.lang.ClassLoader.defineClass1(Native Method) ~[?:1.8.0_91]
at java.lang.ClassLoader.defineClass(Unknown Source) ~[?:1.8.0_91]
at java.security.SecureClassLoader.defineClass(Unknown Source) ~[?:1.8.0_91]
at java.net.URLClassLoader.defineClass(Unknown Source) ~[?:1.8.0_91]
at java.net.URLClassLoader.access$100(Unknown Source) ~[?:1.8.0_91]
at java.net.URLClassLoader$1.run(Unknown Source) ~[?:1.8.0_91]
at java.net.URLClassLoader$1.run(Unknown Source) ~[?:1.8.0_91]
at java.security.AccessController.doPrivileged(Native Method) ~[?:1.8.0_91]
at java.net.URLClassLoader.findClass(Unknown Source) ~[?:1.8.0_91]
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:117) ~[launchwrapper-1.12.jar:?]
at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_91]
at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_91]
at java.lang.Class.forName0(Native Method) ~[?:1.8.0_91]
at java.lang.Class.forName(Unknown Source) ~[?:1.8.0_91]
at net.minecraftforge.fml.relauncher.CoreModManager.loadCoreMod(CoreModManager.java:536) ~[forge-1.8.9-11.15.1.1902-1.8.9.jar:?]
at net.minecraftforge.fml.relauncher.CoreModManager.discoverCoreMods(CoreModManager.java:416) ~[forge-1.8.9-11.15.1.1902-1.8.9.jar:?]
at net.minecraftforge.fml.relauncher.CoreModManager.handleLaunch(CoreModManager.java:246) ~[forge-1.8.9-11.15.1.1902-1.8.9.jar:?]
at net.minecraftforge.fml.relauncher.FMLLaunchHandler.setupHome(FMLLaunchHandler.java:95) [forge-1.8.9-11.15.1.1902-1.8.9.jar:?]
at net.minecraftforge.fml.relauncher.FMLLaunchHandler.setupClient(FMLLaunchHandler.java:72) [forge-1.8.9-11.15.1.1902-1.8.9.jar:?]
at net.minecraftforge.fml.relauncher.FMLLaunchHandler.configureForClientLaunch(FMLLaunchHandler.java:34) [forge-1.8.9-11.15.1.1902-1.8.9.jar:?]
at net.minecraftforge.fml.common.launcher.FMLTweaker.injectIntoClassLoader(FMLTweaker.java:119) [forge-1.8.9-11.15.1.1902-1.8.9.jar:?]
at net.minecraft.launchwrapper.Launch.launch(Launch.java:115) [launchwrapper-1.12.jar:?] at net.minecraft.launchwrapper.Launch.main(Launch.java:28) [launchwrapper-1.12.jar:?]
Caused by: java.lang.ClassNotFoundException: cpw.mods.fml.relauncher.IFMLLoadingPlugin
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:191) ~[launchwrapper-1.12.jar:?]
at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_91]
at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_91]
... 23 more
Caused by: java.lang.NullPointerException
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:182) ~[launchwrapper-1.12.jar:?]
at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_91]
at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_91]
... 23 more
Exception in thread "main" [17:37:35] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:-1]: java.lang.NoClassDefFoundError: cpw/mods/fml/relauncher/IFMLLoadingPlugin
[17:37:35] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:-1]: at java.lang.ClassLoader.defineClass1(Native Method)
[17:37:35] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:-1]: at java.lang.ClassLoader.defineClass(Unknown Source)
[17:37:35] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:-1]: at java.security.SecureClassLoader.defineClass(Unknown Source)
[17:37:35] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:-1]: at java.net.URLClassLoader.defineClass(Unknown Source)
[17:37:35] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:-1]: at java.net.URLClassLoader.access$100(Unknown Source)
[17:37:35] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:-1]: at java.net.URLClassLoader$1.run(Unknown Source)
[17:37:35] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:-1]: at java.net.URLClassLoader$1.run(Unknown Source)
[17:37:35] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:-1]: at java.security.AccessController.doPrivileged(Native Method)
[17:37:35] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:-1]: at java.net.URLClassLoader.findClass(Unknown Source)
[17:37:35] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:-1]: at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:117)
[17:37:35] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:-1]: at java.lang.ClassLoader.loadClass(Unknown Source)
[17:37:35] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:-1]: at java.lang.ClassLoader.loadClass(Unknown Source)
[17:37:35] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:-1]: at java.lang.Class.forName0(Native Method)
[17:37:35] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:-1]: at java.lang.Class.forName(Unknown Source)
[17:37:35] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:-1]: at net.minecraftforge.fml.relauncher.CoreModManager.loadCoreMod(CoreModManager.java:536)
[17:37:35] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:-1]: at net.minecraftforge.fml.relauncher.CoreModManager.discoverCoreMods(CoreModManager.java:416)
[17:37:35] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:-1]: at net.minecraftforge.fml.relauncher.CoreModManager.handleLaunch(CoreModManager.java:246)
[17:37:35] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:-1]: at net.minecraftforge.fml.relauncher.FMLLaunchHandler.setupHome(FMLLaunchHandler.java:95)
[17:37:35] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:-1]: at net.minecraftforge.fml.relauncher.FMLLaunchHandler.setupClient(FMLLaunchHandler.java:72)
[17:37:35] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:-1]: at net.minecraftforge.fml.relauncher.FMLLaunchHandler.configureForClientLaunch(FMLLaunchHandler.java:34)
[17:37:35] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:-1]: at net.minecraftforge.fml.common.launcher.FMLTweaker.injectIntoClassLoader(FMLTweaker.java:119)
[17:37:35] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:-1]: at net.minecraft.launchwrapper.Launch.launch(Launch.java:115)
[17:37:35] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:-1]: at net.minecraft.launchwrapper.Launch.main(Launch.java:28)
[17:37:35] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:-1]: Caused by: java.lang.ClassNotFoundException: cpw.mods.fml.relauncher.IFMLLoadingPlugin
[17:37:35] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:-1]: at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:191)
[17:37:35] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:-1]: at java.lang.ClassLoader.loadClass(Unknown Source)
[17:37:35] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:-1]: at java.lang.ClassLoader.loadClass(Unknown Source)
[17:37:35] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:-1]: ... 23 more
[17:37:35] [main/INFO] [STDERR]: [java.lang.Throwable:printStackTrace:-1]: Caused by: java.lang.NullPointerException
[17:37:35] [main/INFO] [STDERR]: [java.lang.Throwable:printStackTrace:-1]: at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:182)
[17:37:35] [main/INFO] [STDERR]: [java.lang.Throwable:printStackTrace:-1]

I dont have any mods installed just forge

Are you sure you have no mods installed? I suggest checking the mods folder anyway, because that crash looks like there's a mod for a different version of Minecraft present.