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So This has happened to me in the past, but I don't know how I fixed it. Right when I click "play" the tab disappears, and about 5 seconds later I get a crash report. I am pretty sure it has to do with Code Chicken Core and NEI, and i have gotten the newest 1.7.10 version and redownloaded over and over. I tried playing just Code Chicken Core by itself, and it works. I have no idea how to fix this so can someone help me?

Crash Report:

[13:55:01] [main/INFO] [LaunchWrapper]: Loading tweak class name cpw.mods.fml.common.launcher.FMLTweaker
[13:55:01] [main/INFO] [LaunchWrapper]: Using primary tweak class name cpw.mods.fml.common.launcher.FMLTweaker
[13:55:01] [main/INFO] [LaunchWrapper]: Calling tweak class cpw.mods.fml.common.launcher.FMLTweaker
[13:55:01] [main/INFO] [FML]: Forge Mod Loader version 7.99.40.1614 for Minecraft 1.7.10 loading
[13:55:01] [main/INFO] [FML]: Java is Java HotSpot(TM) 64-Bit Server VM, version 1.8.0_112, running on Windows 7:amd64:6.1, installed at C:\Program Files\Java\jre1.8.0_112
[13:55:02] [main/WARN] [FML]: The coremod codechicken.core.launch.CodeChickenCorePlugin does not have a MCVersion annotation, it may cause issues with this version of Minecraft
[13:55:03] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: java.lang.NoClassDefFoundError: net/minecraftforge/fml/relauncher/IFMLLoadingPlugin
[13:55:03] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: at java.lang.ClassLoader.defineClass1(Native Method)
[13:55:03] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: at java.lang.ClassLoader.defineClass(Unknown Source)
[13:55:03] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: at java.security.SecureClassLoader.defineClass(Unknown Source)
[13:55:03] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: at java.net.URLClassLoader.defineClass(Unknown Source)
[13:55:03] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: at java.net.URLClassLoader.access$100(Unknown Source)
[13:55:03] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: at java.net.URLClassLoader$1.run(Unknown Source)
[13:55:03] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: at java.net.URLClassLoader$1.run(Unknown Source)
[13:55:03] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: at java.security.AccessController.doPrivileged(Native Method)
[13:55:03] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: at java.net.URLClassLoader.findClass(Unknown Source)
[13:55:03] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:117)
[13:55:03] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: at java.lang.ClassLoader.loadClass(Unknown Source)
[13:55:03] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: at java.lang.ClassLoader.loadClass(Unknown Source)
[13:55:03] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: at java.lang.Class.forName0(Native Method)
[13:55:03] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: at java.lang.Class.forName(Unknown Source)
[13:55:03] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: at cpw.mods.fml.relauncher.CoreModManager.loadCoreMod(CoreModManager.java:460)
[13:55:03] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: at cpw.mods.fml.relauncher.CoreModManager.discoverCoreMods(CoreModManager.java:389)
[13:55:03] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: at cpw.mods.fml.relauncher.CoreModManager.handleLaunch(CoreModManager.java:221)
[13:55:03] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: at cpw.mods.fml.relauncher.FMLLaunchHandler.setupHome(FMLLaunchHandler.java:90)
[13:55:03] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: at cpw.mods.fml.relauncher.FMLLaunchHandler.setupClient(FMLLaunchHandler.java:67)
[13:55:03] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: at cpw.mods.fml.relauncher.FMLLaunchHandler.configureForClientLaunch(FMLLaunchHandler.java:34)
[13:55:03] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: at cpw.mods.fml.common.launcher.FMLTweaker.injectIntoClassLoader(FMLTweaker.java:126)
[13:55:03] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: at net.minecraft.launchwrapper.Launch.launch(Launch.java:115)
[13:55:03] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: at net.minecraft.launchwrapper.Launch.main(Launch.java:28)
[13:55:03] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: Caused by: java.lang.ClassNotFoundException: net.minecraftforge.fml.relauncher.IFMLLoadingPlugin
[13:55:03] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:191)
[13:55:03] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: at java.lang.ClassLoader.loadClass(Unknown Source)
[13:55:03] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: at java.lang.ClassLoader.loadClass(Unknown Source)
[13:55:03] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: ... 23 more
[13:55:03] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: Caused by: java.lang.NullPointerException
[13:55:03] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:182)
[13:55:03] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: ... 25 more
[13:55:03] [main/ERROR] [FML]: An error occurred trying to configure the minecraft home at C:\Users\Harsh\AppData\Roaming\.minecraft for Forge Mod Loader
java.lang.NoClassDefFoundError: net/minecraftforge/fml/relauncher/IFMLLoadingPlugin
at java.lang.ClassLoader.defineClass1(Native Method) ~[?:1.8.0_112]
at java.lang.ClassLoader.defineClass(Unknown Source) ~[?:1.8.0_112]
at java.security.SecureClassLoader.defineClass(Unknown Source) ~[?:1.8.0_112]
at java.net.URLClassLoader.defineClass(Unknown Source) ~[?:1.8.0_112]
at java.net.URLClassLoader.access$100(Unknown Source) ~[?:1.8.0_112]
at java.net.URLClassLoader$1.run(Unknown Source) ~[?:1.8.0_112]
at java.net.URLClassLoader$1.run(Unknown Source) ~[?:1.8.0_112]
at java.security.AccessController.doPrivileged(Native Method) ~[?:1.8.0_112]
at java.net.URLClassLoader.findClass(Unknown Source) ~[?:1.8.0_112]
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:117) ~[launchwrapper-1.12.jar:?]
at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_112]
at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_112]
at java.lang.Class.forName0(Native Method) ~[?:1.8.0_112]
at java.lang.Class.forName(Unknown Source) ~[?:1.8.0_112]
at cpw.mods.fml.relauncher.CoreModManager.loadCoreMod(CoreModManager.java:460) ~[forge-1.7.10-10.13.4.1614-1.7.10.jar:?]
at cpw.mods.fml.relauncher.CoreModManager.discoverCoreMods(CoreModManager.java:389) ~[forge-1.7.10-10.13.4.1614-1.7.10.jar:?]
at cpw.mods.fml.relauncher.CoreModManager.handleLaunch(CoreModManager.java:221) ~[forge-1.7.10-10.13.4.1614-1.7.10.jar:?]
at cpw.mods.fml.relauncher.FMLLaunchHandler.setupHome(FMLLaunchHandler.java:90) [forge-1.7.10-10.13.4.1614-1.7.10.jar:?]
at cpw.mods.fml.relauncher.FMLLaunchHandler.setupClient(FMLLaunchHandler.java:67) [forge-1.7.10-10.13.4.1614-1.7.10.jar:?]
at cpw.mods.fml.relauncher.FMLLaunchHandler.configureForClientLaunch(FMLLaunchHandler.java:34) [forge-1.7.10-10.13.4.1614-1.7.10.jar:?]
at cpw.mods.fml.common.launcher.FMLTweaker.injectIntoClassLoader(FMLTweaker.java:126) [forge-1.7.10-10.13.4.1614-1.7.10.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: net.minecraftforge.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_112]
at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_112]
... 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_112]
at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_112]
... 23 more
Exception in thread "main" [13:55:03] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: java.lang.NoClassDefFoundError: net/minecraftforge/fml/relauncher/IFMLLoadingPlugin
[13:55:03] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: at java.lang.ClassLoader.defineClass1(Native Method)
[13:55:03] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: at java.lang.ClassLoader.defineClass(Unknown Source)
[13:55:03] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: at java.security.SecureClassLoader.defineClass(Unknown Source)
[13:55:03] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: at java.net.URLClassLoader.defineClass(Unknown Source)
[13:55:03] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: at java.net.URLClassLoader.access$100(Unknown Source)
[13:55:03] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: at java.net.URLClassLoader$1.run(Unknown Source)
[13:55:03] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: at java.net.URLClassLoader$1.run(Unknown Source)
[13:55:03] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: at java.security.AccessController.doPrivileged(Native Method)
[13:55:03] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: at java.net.URLClassLoader.findClass(Unknown Source)
[13:55:03] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:117)
[13:55:03] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: at java.lang.ClassLoader.loadClass(Unknown Source)
[13:55:03] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: at java.lang.ClassLoader.loadClass(Unknown Source)
[13:55:03] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: at java.lang.Class.forName0(Native Method)
[13:55:03] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: at java.lang.Class.forName(Unknown Source)
[13:55:03] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: at cpw.mods.fml.relauncher.CoreModManager.loadCoreMod(CoreModManager.java:460)
[13:55:03] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: at cpw.mods.fml.relauncher.CoreModManager.discoverCoreMods(CoreModManager.java:389)
[13:55:03] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: at cpw.mods.fml.relauncher.CoreModManager.handleLaunch(CoreModManager.java:221)
[13:55:03] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: at cpw.mods.fml.relauncher.FMLLaunchHandler.setupHome(FMLLaunchHandler.java:90)
[13:55:03] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: at cpw.mods.fml.relauncher.FMLLaunchHandler.setupClient(FMLLaunchHandler.java:67)
[13:55:03] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: at cpw.mods.fml.relauncher.FMLLaunchHandler.configureForClientLaunch(FMLLaunchHandler.java:34)
[13:55:03] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: at cpw.mods.fml.common.launcher.FMLTweaker.injectIntoClassLoader(FMLTweaker.java:126)
[13:55:03] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: at net.minecraft.launchwrapper.Launch.launch(Launch.java:115)
[13:55:03] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: at net.minecraft.launchwrapper.Launch.main(Launch.java:28)
[13:55:03] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: Caused by: java.lang.ClassNotFoundException: net.minecraftforge.fml.relauncher.IFMLLoadingPlugin
[13:55:03] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:191)
[13:55:03] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: at java.lang.ClassLoader.loadClass(Unknown Source)
[13:55:03] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: at java.lang.ClassLoader.loadClass(Unknown Source)
[13:55:03] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: ... 23 more
[13:55:03] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: Caused by: java.lang.NullPointerException
[13:55:03] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:182)
[13:55:03] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: ... 25 more

Are you sure you're using the right versions of NEI and CoreChickenCode?

I am using CodeChickenCore-1.7.10-1.0.7.47-universal and NotEnoughItems-1.7.10-1.0.5.120-universal so yeah.

Weird, both versions work for me...

I tried running them by themselves, and it works. does that mean it is another mod in my modpack that is conflicting with those mods?

Oh i figured it out. One of my mods, Craft++ was causing some issues but I fixed it. Thank you for trying to help though!