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Hello I am trying to play pixelmon and get this error when I launch my client.

Can anyone tell my why this is happening and how to fix it?

2016-07-14 20:21:04,520 WARN Unable to instantiate org.fusesource.jansi.WindowsAnsiOutputStream
2016-07-14 20:21:04,521 WARN Unable to instantiate org.fusesource.jansi.WindowsAnsiOutputStream
[20:21:04] [main/INFO] [LaunchWrapper]: Loading tweak class name net.minecraftforge.fml.common.launcher.FMLTweaker
[20:21:04] [main/INFO] [LaunchWrapper]: Using primary tweak class name net.minecraftforge.fml.common.launcher.FMLTweaker
[20:21:04] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.common.launcher.FMLTweaker
[20:21:04] [main/INFO] [FML]: Forge Mod Loader version 11.15.1.1902 for Minecraft 1.8.9 loading
[20:21:04] [main/INFO] [FML]: Java is Java HotSpot(TM) 64-Bit Server VM, version 1.8.0_25, running on Windows 10:amd64:10.0, installed at C:\Program Files (x86)\Minecraft\runtime\jre-x64\1.8.0_25
[20:21:04] [main/INFO] [STDERR]: [net.minecraftforge.fml.relauncher.FMLLaunchHandler:setupHome:99]: java.lang.NoClassDefFoundError: cpw/mods/fml/relauncher/IFMLLoadingPlugin
[20:21:04] [main/INFO] [STDERR]: [net.minecraftforge.fml.relauncher.FMLLaunchHandler:setupHome:99]: at java.lang.ClassLoader.defineClass1(Native Method)
[20:21:04] [main/INFO] [STDERR]: [net.minecraftforge.fml.relauncher.FMLLaunchHandler:setupHome:99]: at java.lang.ClassLoader.defineClass(ClassLoader.java:760)
[20:21:04] [main/INFO] [STDERR]: [net.minecraftforge.fml.relauncher.FMLLaunchHandler:setupHome:99]: at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
[20:21:04] [main/INFO] [STDERR]: [net.minecraftforge.fml.relauncher.FMLLaunchHandler:setupHome:99]: at java.net.URLClassLoader.defineClass(URLClassLoader.java:455)
[20:21:04] [main/INFO] [STDERR]: [net.minecraftforge.fml.relauncher.FMLLaunchHandler:setupHome:99]: at java.net.URLClassLoader.access$100(URLClassLoader.java:73)
[20:21:04] [main/INFO] [STDERR]: [net.minecraftforge.fml.relauncher.FMLLaunchHandler:setupHome:99]: at java.net.URLClassLoader$1.run(URLClassLoader.java:367)
[20:21:04] [main/INFO] [STDERR]: [net.minecraftforge.fml.relauncher.FMLLaunchHandler:setupHome:99]: at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
[20:21:04] [main/INFO] [STDERR]: [net.minecraftforge.fml.relauncher.FMLLaunchHandler:setupHome:99]: at java.security.AccessController.doPrivileged(Native Method)
[20:21:04] [main/INFO] [STDERR]: [net.minecraftforge.fml.relauncher.FMLLaunchHandler:setupHome:99]: at java.net.URLClassLoader.findClass(URLClassLoader.java:360)
[20:21:04] [main/INFO] [STDERR]: [net.minecraftforge.fml.relauncher.FMLLaunchHandler:setupHome:99]: at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:117)
[20:21:04] [main/INFO] [STDERR]: [net.minecraftforge.fml.relauncher.FMLLaunchHandler:setupHome:99]: at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
[20:21:04] [main/INFO] [STDERR]: [net.minecraftforge.fml.relauncher.FMLLaunchHandler:setupHome:99]: at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
[20:21:04] [main/INFO] [STDERR]: [net.minecraftforge.fml.relauncher.FMLLaunchHandler:setupHome:99]: at java.lang.Class.forName0(Native Method)
[20:21:04] [main/INFO] [STDERR]: [net.minecraftforge.fml.relauncher.FMLLaunchHandler:setupHome:99]: at java.lang.Class.forName(Class.java:344)
[20:21:04] [main/INFO] [STDERR]: [net.minecraftforge.fml.relauncher.FMLLaunchHandler:setupHome:99]: at net.minecraftforge.fml.relauncher.CoreModManager.loadCoreMod(CoreModManager.java:536)
[20:21:04] [main/INFO] [STDERR]: [net.minecraftforge.fml.relauncher.FMLLaunchHandler:setupHome:99]: at net.minecraftforge.fml.relauncher.CoreModManager.discoverCoreMods(CoreModManager.java:416)
[20:21:04] [main/INFO] [STDERR]: [net.minecraftforge.fml.relauncher.FMLLaunchHandler:setupHome:99]: at net.minecraftforge.fml.relauncher.CoreModManager.handleLaunch(CoreModManager.java:246)
[20:21:04] [main/INFO] [STDERR]: [net.minecraftforge.fml.relauncher.FMLLaunchHandler:setupHome:99]: at net.minecraftforge.fml.relauncher.FMLLaunchHandler.setupHome(FMLLaunchHandler.java:95)
[20:21:04] [main/INFO] [STDERR]: [net.minecraftforge.fml.relauncher.FMLLaunchHandler:setupHome:99]: at net.minecraftforge.fml.relauncher.FMLLaunchHandler.setupClient(FMLLaunchHandler.java:72)
[20:21:04] [main/INFO] [STDERR]: [net.minecraftforge.fml.relauncher.FMLLaunchHandler:setupHome:99]: at net.minecraftforge.fml.relauncher.FMLLaunchHandler.configureForClientLaunch(FMLLaunchHandler.java:34)
[20:21:04] [main/INFO] [STDERR]: [net.minecraftforge.fml.relauncher.FMLLaunchHandler:setupHome:99]: at net.minecraftforge.fml.common.launcher.FMLTweaker.injectIntoClassLoader(FMLTweaker.java:119)
[20:21:04] [main/INFO] [STDERR]: [net.minecraftforge.fml.relauncher.FMLLaunchHandler:setupHome:99]: at net.minecraft.launchwrapper.Launch.launch(Launch.java:115)
[20:21:04] [main/INFO] [STDERR]: [net.minecraftforge.fml.relauncher.FMLLaunchHandler:setupHome:99]: at net.minecraft.launchwrapper.Launch.main(Launch.java:28)
[20:21:04] [main/INFO] [STDERR]: [java.lang.Throwable:printStackTrace:634]: Caused by: java.lang.ClassNotFoundException: cpw.mods.fml.relauncher.IFMLLoadingPlugin
[20:21:04] [main/INFO] [STDERR]: [java.lang.Throwable:printStackTrace:634]: at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:191)
[20:21:04] [main/INFO] [STDERR]: [java.lang.Throwable:printStackTrace:634]: at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
[20:21:04] [main/INFO] [STDERR]: [java.lang.Throwable:printStackTrace:634]: at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
[20:21:04] [main/INFO] [STDERR]: [java.lang.Throwable:printStackTrace:634]: ... 23 more
[20:21:04] [main/INFO] [STDERR]: [java.lang.Throwable:printStackTrace:643]: Caused by: java.lang.NullPointerException
[20:21:04] [main/INFO] [STDERR]: [java.lang.Throwable:printStackTrace:643]: at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:182)
[20:21:04] [main/INFO] [STDERR]: [java.lang.Throwable:printStackTrace:643]: ... 25 more
[20:21:04] [main/ERROR] [FML]: An error occurred trying to configure the minecraft home at C:\Users\Logan\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_25]
at java.lang.ClassLoader.defineClass(ClassLoader.java:760) ~[?:1.8.0_25]
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142) ~[?:1.8.0_25]
at java.net.URLClassLoader.defineClass(URLClassLoader.java:455) ~[?:1.8.0_25]
at java.net.URLClassLoader.access$100(URLClassLoader.java:73) ~[?:1.8.0_25]
at java.net.URLClassLoader$1.run(URLClassLoader.java:367) ~[?:1.8.0_25]
at java.net.URLClassLoader$1.run(URLClassLoader.java:361) ~[?:1.8.0_25]
at java.security.AccessController.doPrivileged(Native Method) ~[?:1.8.0_25]
at java.net.URLClassLoader.findClass(URLClassLoader.java:360) ~[?:1.8.0_25]
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:117) ~[launchwrapper-1.12.jar:?]
at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[?:1.8.0_25]
at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[?:1.8.0_25]
at java.lang.Class.forName0(Native Method) ~[?:1.8.0_25]
at java.lang.Class.forName(Class.java:344) ~[?:1.8.0_25]
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(ClassLoader.java:424) ~[?:1.8.0_25]
at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[?:1.8.0_25]
... 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(ClassLoader.java:424) ~[?:1.8.0_25]
at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[?:1.8.0_25]
... 23 more
Exception in thread "main" [20:21:04] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1052]: java.lang.NoClassDefFoundError: cpw/mods/fml/relauncher/IFMLLoadingPlugin
[20:21:04] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1052]: at java.lang.ClassLoader.defineClass1(Native Method)
[20:21:04] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1052]: at java.lang.ClassLoader.defineClass(ClassLoader.java:760)
[20:21:04] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1052]: at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
[20:21:04] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1052]: at java.net.URLClassLoader.defineClass(URLClassLoader.java:455)
[20:21:04] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1052]: at java.net.URLClassLoader.access$100(URLClassLoader.java:73)
[20:21:04] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1052]: at java.net.URLClassLoader$1.run(URLClassLoader.java:367)
[20:21:04] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1052]: at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
[20:21:04] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1052]: at java.security.AccessController.doPrivileged(Native Method)
[20:21:04] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1052]: at java.net.URLClassLoader.findClass(URLClassLoader.java:360)
[20:21:04] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1052]: at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:117)
[20:21:04] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1052]: at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
[20:21:04] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1052]: at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
[20:21:04] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1052]: at java.lang.Class.forName0(Native Method)
[20:21:04] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1052]: at java.lang.Class.forName(Class.java:344)
[20:21:04] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1052]: at net.minecraftforge.fml.relauncher.CoreModManager.loadCoreMod(CoreModManager.java:536)
[20:21:04] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1052]: at net.minecraftforge.fml.relauncher.CoreModManager.discoverCoreMods(CoreModManager.java:416)
[20:21:04] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1052]: at net.minecraftforge.fml.relauncher.CoreModManager.handleLaunch(CoreModManager.java:246)
[20:21:04] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1052]: at net.minecraftforge.fml.relauncher.FMLLaunchHandler.setupHome(FMLLaunchHandler.java:95)
[20:21:04] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1052]: at net.minecraftforge.fml.relauncher.FMLLaunchHandler.setupClient(FMLLaunchHandler.java:72)
[20:21:04] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1052]: at net.minecraftforge.fml.relauncher.FMLLaunchHandler.configureForClientLaunch(FMLLaunchHandler.java:34)
[20:21:04] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1052]: at net.minecraftforge.fml.common.launcher.FMLTweaker.injectIntoClassLoader(FMLTweaker.java:119)
[20:21:04] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1052]: at net.minecraft.launchwrapper.Launch.launch(Launch.java:115)
[20:21:04] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1052]: at net.minecraft.launchwrapper.Launch.main(Launch.java:28)
[20:21:04] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1061]: Caused by: java.lang.ClassNotFoundException: cpw.mods.fml.relauncher.IFMLLoadingPlugin
[20:21:04] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1061]: at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:191)
[20:21:04] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1061]: at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
[20:21:04] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1061]: at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
[20:21:04] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1061]: ... 23 more
[20:21:04] [main/INFO] [STDERR]: [java.lang.Throwable:printStackTrace:643]: Caused by: java.lang.NullPointerException
[20:21:04] [main/INFO] [STDERR]: [java.lang.Throwable:printStackTrace:643]: at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:182)
[20:21:04] [main/INFO] [STDERR]: [java.lang.Throwable:printStackTrace:643]: ... 25 more

when i made a pack for myself yesterday i got a similer error but i got this same line Caused by: java.lang.NullPointerException

and it was a mod conflicting with another mod and it works when i found out what mod it was i hope this helps a littl