Modpack crashes no idea why, but doesn't crash for some.

[Mechageno]

Alright well here's the problem.This is a modpack i made called Battlemon, the modpack works fine for me and my friend. But two others that have been trying to play it lately, well it just doesn't work for them. The pack downloads just fine but once they get to the mojang screen it hangs there forever and stops responding(i tried getting them to wait like an hour to see if it would load). What's wierd is that this happens to 2 other people but not me and my friend. They get the same error(i've looked at the logs), they both use different versions of windows (7 and 8). I tried giving them my installation thinking theirs was corrupted but they got the same error. I have no idea why and I don't understand the error log so here's the log of what happens.

http://pastebin.com/15M2FNrV

[TeamEnternode]

For anyone who wants to try and help this man, the error looks like:

1. 2014-01-06 14:30:27 [sEVERE] [ForgeModLoader] Unable to launch
   
2. java.lang.reflect.InvocationTargetException
   
3. at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
   
4. at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
   
5. at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
   
6. at java.lang.reflect.Method.invoke(Unknown Source)
   
7. at net.minecraft.launchwrapper.Launch.launch(Launch.java:131)
   
8. at net.minecraft.launchwrapper.Launch.main(Launch.java:27)
   
9. Caused by: java.lang.NoClassDefFoundError: net/minecraft/client/CallableLaunchedVersion
   
10. at net.minecraft.client.Minecraft.func_71396_d(Minecraft.java:2299)
    
11. at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:813)
    
12. at net.minecraft.client.main.Main.main(SourceFile:101)
    
13. ... 6 more
    
14. Caused by: java.lang.ClassNotFoundException: net.minecraft.client.CallableLaunchedVersion
    
15. at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:186)
    
16. at java.lang.ClassLoader.loadClass(Unknown Source)
    
17. at java.lang.ClassLoader.loadClass(Unknown Source)
    
18. ... 9 more
    
19. Caused by: java.lang.ClassCircularityError: poersch/minecraft/core/IClassPatcher
    
20. at poersch.minecraft.core.ClassPatcher.transform(ClassPatcher.java:48)
    
21. at net.minecraft.launchwrapper.LaunchClassLoader.runTransformers(LaunchClassLoader.java:274)
    
22. at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:172)
    
23. ... 11 more
    

However, I can't help him as I have know idea what the hell the crash report means.

[TwoTails]

check inside your mods untill you find a folder named "poersch" the mod that has that folder, delete it.