Minecraft Forums

I recently downloaded Minecraft forge so I could download mods for it. It was there on my profile selector, so I clicked on forge and played. But instead of the minecraft homescreen appearing, I was redirected to the Game Output. This text appeared...

2016-04-01 21:33:55,996 WARN Unable to instantiate org.fusesource.jansi.WindowsAnsiOutputStream
2016-04-01 21:33:55,999 WARN Unable to instantiate org.fusesource.jansi.WindowsAnsiOutputStream
[21:33:56] [main/INFO] [LaunchWrapper]: Loading tweak class name net.minecraftforge.fml.common.launcher.FMLTweaker
[21:33:56] [main/INFO] [LaunchWrapper]: Using primary tweak class name net.minecraftforge.fml.common.launcher.FMLTweaker
[21:33:56] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.common.launcher.FMLTweaker
[21:33:56] [main/INFO] [FML]: Forge Mod Loader version 12.16.0.1820 for Minecraft 1.9 loading
[21:33:56] [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
[21:33:56] [main/INFO] [LaunchWrapper]: Loading tweak class name net.minecraftforge.fml.common.launcher.FMLInjectionAndSortingTweaker
[21:33:56] [main/INFO] [LaunchWrapper]: Loading tweak class name net.minecraftforge.fml.common.launcher.FMLDeobfTweaker
[21:33:56] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.common.launcher.FMLInjectionAndSortingTweaker
[21:33:56] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.common.launcher.FMLInjectionAndSortingTweaker
[21:33:56] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.relauncher.CoreModManager$FMLPluginWrapper
[21:33:58] [main/INFO] [FML]: Found valid fingerprint for Minecraft Forge. Certificate fingerprint e3c3d50c7c986df74c645c0ac54639741c90a557
[21:33:58] [main/INFO] [FML]: Found valid fingerprint for Minecraft. Certificate fingerprint cd99959656f753dc28d863b46769f7f8fbaefcfc
[21:33:58] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.relauncher.CoreModManager$FMLPluginWrapper
[21:33:58] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.common.launcher.FMLDeobfTweaker
[21:33:59] [main/INFO] [LaunchWrapper]: Loading tweak class name net.minecraftforge.fml.common.launcher.TerminalTweaker
[21:33:59] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.common.launcher.TerminalTweaker
[21:33:59] [main/INFO] [LaunchWrapper]: Launching wrapped minecraft {net.minecraft.client.main.Main}
2016-04-01 21:34:00,278 WARN Unable to instantiate org.fusesource.jansi.WindowsAnsiOutputStream
2016-04-01 21:34:00,317 WARN Unable to instantiate org.fusesource.jansi.WindowsAnsiOutputStream
2016-04-01 21:34:00,321 WARN Unable to instantiate org.fusesource.jansi.WindowsAnsiOutputStream
[21:34:00] [main/INFO] [STDOUT]: [net.minecraft.client.main.Main:main:56]: Completely ignored arguments: [--nativeLauncherVersion, 301]
[21:34:00] [Client thread/INFO]: Setting user: Ry4N1567
[21:34:01] [Client thread/ERROR] [LaunchWrapper]: Unable to launch
java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_25]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_25]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_25]
at java.lang.reflect.Method.invoke(Method.java:483) ~[?:1.8.0_25]
at net.minecraft.launchwrapper.Launch.launch(Launch.java:135) [launchwrapper-1.12.jar:?]
at net.minecraft.launchwrapper.Launch.main(Launch.java:28) [launchwrapper-1.12.jar:?]
Caused by: java.lang.ExceptionInInitializerError
at net.minecraft.util.SoundEvent.<clinit>(SoundEvent.java:9) ~[nf.class:?]
at net.minecraft.init.Bootstrap.func_151354_b(SourceFile:501) ~[kn.class:?]
at net.minecraft.client.Minecraft.<init>(Minecraft.java:337) ~[bcf.class:?]
at net.minecraft.client.main.Main.main(SourceFile:124) ~[Main.class:?]
... 6 more
Caused by: java.lang.NegativeArraySizeException: nbits < 0: -2147483648
at java.util.BitSet.<init>(BitSet.java:159) ~[?:1.8.0_25]
at net.minecraftforge.fml.common.registry.FMLControlledNamespacedRegistry.<init>(FMLControlledNamespacedRegistry.java:77) ~[FMLControlledNamespacedRegistry.class:?]
at net.minecraftforge.fml.common.registry.PersistentRegistryManager$PersistentRegistry.createRegistry(PersistentRegistryManager.java:85) ~[PersistentRegistryManager$PersistentRegistry.class:?]
at net.minecraftforge.fml.common.registry.PersistentRegistryManager$PersistentRegistry.access$000(PersistentRegistryManager.java:45) ~[PersistentRegistryManager$PersistentRegistry.class:?]
at net.minecraftforge.fml.common.registry.PersistentRegistryManager.createRegistry(PersistentRegistryManager.java:139) ~[PersistentRegistryManager.class:?]
at net.minecraftforge.fml.common.registry.GameData.<init>(GameData.java:64) ~[GameData.class:?]
at net.minecraftforge.fml.common.registry.GameData.<clinit>(GameData.java:56) ~[GameData.class:?]
at net.minecraft.util.SoundEvent.<clinit>(SoundEvent.java:9) ~[nf.class:?]
at net.minecraft.init.Bootstrap.func_151354_b(SourceFile:501) ~[kn.class:?]
at net.minecraft.client.Minecraft.<init>(Minecraft.java:337) ~[bcf.class:?]
at net.minecraft.client.main.Main.main(SourceFile:124) ~[Main.class:?]
... 6 more
Exception in thread "Client thread" [21:34:01] [Client thread/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1052]: net.minecraftforge.fml.relauncher.FMLSecurityManager$ExitTrappedException
[21:34:01] [Client thread/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1052]: at net.minecraftforge.fml.relauncher.FMLSecurityManager.checkPermission(FMLSecurityManager.java:30)
[21:34:01] [Client thread/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1052]: at java.lang.SecurityManager.checkExit(SecurityManager.java:761)
[21:34:01] [Client thread/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1052]: at java.lang.Runtime.exit(Runtime.java:107)
[21:34:01] [Client thread/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1052]: at java.lang.System.exit(System.java:968)
[21:34:01] [Client thread/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1052]: at net.minecraft.launchwrapper.Launch.launch(Launch.java:138)
[21:34:01] [Client thread/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1052]: at net.minecraft.launchwrapper.Launch.main(Launch.java:28)

Can some plz explain what this text means and how to solve it.