Hola Buenas

He instalado Forge-1.8 y al iniciarlo me devuelve el siguiente error:

Launching game
Unpacking natives to C:\Users\JUANCA\AppData\Roaming\.minecraft\versions\1.8-Forge11.14.0.1295-1.8\1.8-Forge11.14.0.1295-1.8-natives-34390169031631
Launching in C:\Users\JUANCA\AppData\Roaming\.minecraft
Half command: C:\Program Files (x86)\Java\jre7\bin\javaw.exe -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G -Djava.library.path=C:\Users\JUANCA\AppData\Roaming\.minecraft\versions\1.8-Forge11.14.0.1295-1.8\1.8-Forge11.14.0.1295-1.8-natives-34390169031631 -cp C:\Users\JUANCA\AppData\Roaming\.minecraft\libraries\net\minecraftforge\forge\1.8-11.14.0.1295-1.8\forge-1.8-11.14.0.1295-1.8.jar;C:\Users\JUANCA\AppData\Roaming\.minecraft\libraries\net\minecraft\launchwrapper\1.11\launchwrapper-1.11.jar;C:\Users\JUANCA\AppData\Roaming\.minecraft\libraries\org\ow2\asm\asm-all\5.0.3\asm-all-5.0.3.jar;C:\Users\JUANCA\AppData\Roaming\.minecraft\libraries\com\typesafe\akka\akka-actor_2.11\2.3.3\akka-actor_2.11-2.3.3.jar;C:\Users\JUANCA\AppData\Roaming\.minecraft\libraries\com\typesafe\config\1.2.1\config-1.2.1.jar;C:\Users\JUANCA\AppData\Roaming\.minecraft\libraries\org\scala-lang\scala-actors-migration_2.11\1.1.0\scala-actors-migration_2.11-1.1.0.jar;C:\Users\JUANCA\AppData\Roaming\.minecraft\libraries\org\scala-lang\scala-compiler\2.11.1\scala-compiler-2.11.1.jar;C:\Users\JUANCA\AppData\Roaming\.minecraft\libraries\org\scala-lang\plugins\scala-continuations-library_2.11\1.0.2\scala-continuations-library_2.11-1.0.2.jar;C:\Users\JUANCA\AppData\Roaming\.minecraft\libraries\org\scala-lang\plugins\scala-continuations-plugin_2.11.1\1.0.2\scala-continuations-plugin_2.11.1-1.0.2.jar;C:\Users\JUANCA\AppData\Roaming\.minecraft\libraries\org\scala-lang\scala-library\2.11.1\scala-library-2.11.1.jar;C:\Users\JUANCA\AppData\Roaming\.minecraft\libraries\org\scala-lang\scala-parser-combinators_2.11\1.0.1\scala-parser-combinators_2.11-1.0.1.jar;C:\Users\JUANCA\AppData\Roaming\.minecraft\libraries\org\scala-lang\scala-reflect\2.11.1\scala-reflect-2.11.1.jar;C:\Users\JUANCA\AppData\Roaming\.minecraft\libraries\org\scala-lang\scala-swing_2.11\1.0.1\scala-swing_2.11-1.0.1.jar;C:\Users\JUANCA\AppData\Roaming\.minecraft\libraries\org\scala-lang\scala-xml_2.11\1.0.2\scala-xml_2.11-1.0.2.jar;C:\Users\JUANCA\AppData\Roaming\.minecraft\libraries\lzma\lzma.0.1\lzma-0.0.1.jar;C:\Users\JUANCA\AppData\Roaming\.minecraft\libraries\net\sf\jopt-simple\jopt-simple\4.5\jopt-simple-4.5.jar;C:\Users\JUANCA\AppData\Roaming\.minecraft\versions\1.8-Forge11.14.0.1295-1.8\1.8-Forge11.14.0.1295-1.8.jar net.minecraft.launchwrapper.Launch
Running C:\Program Files (x86)\Java\jre7\bin\javaw.exe -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G -Djava.library.path=C:\Users\JUANCA\AppData\Roaming\.minecraft\versions\1.8-Forge11.14.0.1295-1.8\1.8-Forge11.14.0.1295-1.8-natives-34390169031631 -cp C:\Users\JUANCA\AppData\Roaming\.minecraft\libraries\net\minecraftforge\forge\1.8-11.14.0.1295-1.8\forge-1.8-11.14.0.1295-1.8.jar;C:\Users\JUANCA\AppData\Roaming\.minecraft\libraries\net\minecraft\launchwrapper\1.11\launchwrapper-1.11.jar;C:\Users\JUANCA\AppData\Roaming\.minecraft\libraries\org\ow2\asm\asm-all\5.0.3\asm-all-5.0.3.jar;C:\Users\JUANCA\AppData\Roaming\.minecraft\libraries\com\typesafe\akka\akka-actor_2.11\2.3.3\akka-actor_2.11-2.3.3.jar;C:\Users\JUANCA\AppData\Roaming\.minecraft\libraries\com\typesafe\config\1.2.1\config-1.2.1.jar;C:\Users\JUANCA\AppData\Roaming\.minecraft\libraries\org\scala-lang\scala-actors-migration_2.11\1.1.0\scala-actors-migration_2.11-1.1.0.jar;C:\Users\JUANCA\AppData\Roaming\.minecraft\libraries\org\scala-lang\scala-compiler\2.11.1\scala-compiler-2.11.1.jar;C:\Users\JUANCA\AppData\Roaming\.minecraft\libraries\org\scala-lang\plugins\scala-continuations-library_2.11\1.0.2\scala-continuations-library_2.11-1.0.2.jar;C:\Users\JUANCA\AppData\Roaming\.minecraft\libraries\org\scala-lang\plugins\scala-continuations-plugin_2.11.1\1.0.2\scala-continuations-plugin_2.11.1-1.0.2.jar;C:\Users\JUANCA\AppData\Roaming\.minecraft\libraries\org\scala-lang\scala-library\2.11.1\scala-library-2.11.1.jar;C:\Users\JUANCA\AppData\Roaming\.minecraft\libraries\org\scala-lang\scala-parser-combinators_2.11\1.0.1\scala-parser-combinators_2.11-1.0.1.jar;C:\Users\JUANCA\AppData\Roaming\.minecraft\libraries\org\scala-lang\scala-reflect\2.11.1\scala-reflect-2.11.1.jar;C:\Users\JUANCA\AppData\Roaming\.minecraft\libraries\org\scala-lang\scala-swing_2.11\1.0.1\scala-swing_2.11-1.0.1.jar;C:\Users\JUANCA\AppData\Roaming\.minecraft\libraries\org\scala-lang\scala-xml_2.11\1.0.2\scala-xml_2.11-1.0.2.jar;C:\Users\JUANCA\AppData\Roaming\.minecraft\libraries\lzma\lzma.0.1\lzma-0.0.1.jar;C:\Users\JUANCA\AppData\Roaming\.minecraft\libraries\net\sf\jopt-simple\jopt-simple\4.5\jopt-simple-4.5.jar;C:\Users\JUANCA\AppData\Roaming\.minecraft\versions\1.8-Forge11.14.0.1295-1.8\1.8-Forge11.14.0.1295-1.8.jar net.minecraft.launchwrapper.Launch –username Juanca –version 1.8-Forge11.14.0.1295-1.8 –gameDir C:\Users\JUANCA\AppData\Roaming\.minecraft –assetsDir C:\Users\JUANCA\AppData\Roaming\.minecraft\assets –assetIndex 1.8 –uuid sessionId –accessToken – –userProperties {} –userType ${user_type} –tweakClass net.minecraftforge.fml.common.launcher.FMLTweaker
Client> Exception in thread “main” java.lang.NoClassDefFoundError: org/apache/logging/log4j/Level
Client> at net.minecraft.launchwrapper.Launch.launch(Launch.java:94)
Client> at net.minecraft.launchwrapper.Launch.main(Launch.java:28)
Client> Caused by: java.lang.ClassNotFoundException: org.apache.logging.log4j.Level
Client> at java.net.URLClassLoader$1.run(Unknown Source)
Client> at java.net.URLClassLoader$1.run(Unknown Source)
Client> at java.security.AccessController.doPrivileged(Native Method)
Client> at java.net.URLClassLoader.findClass(Unknown Source)
Client> at java.lang.ClassLoader.loadClass(Unknown Source)
Client> at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
Client> at java.lang.ClassLoader.loadClass(Unknown Source)
Client> … 2 more
Game ended with bad state (exit code 1)
Ignoring visibility rule and showing launcher due to a game crash
Deleting C:\Users\JUANCA\AppData\Roaming\.minecraft\versions\1.8-Forge11.14.0.1295-1.8\1.8-Forge11.14.0.1295-1.8-natives-34390169031631

He probado a instalar java 7 y aún así no fuciona. Necesito ayuda por favor esto deseando instalar mods!!