when i try to launch minecraft 1.8 forge with mods this happens:

 

[17:08:56] [main/INFO] [LaunchWrapper]: Loading tweak class name net.minecraftforge.fml.common.launcher.FMLTweaker

[17:08:56] [main/INFO] [LaunchWrapper]: Using primary tweak class name net.minecraftforge.fml.common.launcher.FMLTweaker

[17:08:56] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.common.launcher.FMLTweaker

[17:08:56] [main/INFO] [FML]: Forge Mod Loader version 11.14.4.1563 for Minecraft 1.8 loading

[17:08:56] [main/INFO] [FML]: Java is Java HotSpot 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

[17:08:56] [main/WARN] [FML]: The coremod codechicken.nei.asm.NEICorePlugin does not have a MCVersion annotation, it may cause issues with this version of Minecraft

[17:08:56] [main/INFO] [LaunchWrapper]: Loading tweak class name net.minecraftforge.fml.common.launcher.FMLInjectionAndSortingTweaker

[17:08:56] [main/INFO] [LaunchWrapper]: Loading tweak class name net.minecraftforge.fml.common.launcher.FMLDeobfTweaker

[17:08:56] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.common.launcher.FMLInjectionAndSortingTweaker

[17:08:56] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.common.launcher.FMLInjectionAndSortingTweaker

[17:08:56] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.relauncher.CoreModManager$FMLPluginWrapper

[17:08:57] [main/INFO] [FML]: Found valid fingerprint for Minecraft. Certificate fingerprint cd99959656f753dc28d863b46769f7f8fbaefcfc

[17:08:57] [main/ERROR] [FML]: FML appears to be missing any signature data. This is not a good thing

[17:08:57] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.relauncher.CoreModManager$FMLPluginWrapper

[17:08:57] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.relauncher.CoreModManager$FMLPluginWrapper

Exception in thread "main" [17:08:57] [main/INFO] [sTDERR]: [java.lang.Throwable$WrappedPrintStream:println:748]: java.lang.NoClassDefFoundError: codechicken/core/launch/CodeChickenCorePlugin

[17:08:57] [main/INFO] [sTDERR]: [java.lang.Throwable$WrappedPrintStream:println:748]: at codechicken.nei.asm.NEICorePlugin.getASMTransformerClass(NEICorePlugin.java:18)

[17:08:57] [main/INFO] [sTDERR]: [java.lang.Throwable$WrappedPrintStream:println:748]: at net.minecraftforge.fml.relauncher.CoreModManager$FMLPluginWrapper.injectIntoClassLoader(CoreModManager.java:117)

[17:08:57] [main/INFO] [sTDERR]: [java.lang.Throwable$WrappedPrintStream:println:748]: at net.minecraft.launchwrapper.Launch.launch(Launch.java:115)

[17:08:57] [main/INFO] [sTDERR]: [java.lang.Throwable$WrappedPrintStream:println:748]: at net.minecraft.launchwrapper.Launch.main(Launch.java:28)

[17:08:57] [main/INFO] [sTDERR]: [java.lang.Throwable$WrappedPrintStream:println:748]: Caused by: java.lang.ClassNotFoundException: codechicken.core.launch.CodeChickenCorePlugin

[17:08:57] [main/INFO] [sTDERR]: [java.lang.Throwable$WrappedPrintStream:println:748]: at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:191)

[17:08:57] [main/INFO] [sTDERR]: [java.lang.Throwable$WrappedPrintStream:println:748]: at java.lang.ClassLoader.loadClass(ClassLoader.java:424)

[17:08:57] [main/INFO] [sTDERR]: [java.lang.Throwable$WrappedPrintStream:println:748]: at java.lang.ClassLoader.loadClass(ClassLoader.java:357)

[17:08:57] [main/INFO] [sTDERR]: [java.lang.Throwable$WrappedPrintStream:println:748]: ... 4 more

[17:08:57] [main/INFO] [sTDERR]: [java.lang.Throwable$WrappedPrintStream:println:748]: Caused by: java.lang.NullPointerException

[17:08:57] [main/INFO] [sTDERR]: [java.lang.Throwable$WrappedPrintStream:println:748]: at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:182)

[17:08:57] [main/INFO] [sTDERR]: [java.lang.Throwable$WrappedPrintStream:println:748]: ... 6 more

Have you installed CodeChickenCore?