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So, i decide to load up my miecraft, with a newly installed Somnia, I crash(Keep in mind here I've also got Better Dungeons, Smart Moving, Dynamic Lights, Back Tools, and Damage Indicators all 1.5.2 installed). I think nothing of it, going to my backup created moments earlier, only to find that (without Somnia installed) I cannot load Minecraft. "Forge Modloader encountered a fatal error" or something along the lines of that. Crash report:

2013-06-01 21:32:11 [INFO] [ForgeModLoader] Forge Mod Loader version 5.2.17.716 for Minecraft 1.5.2 loading
2013-06-01 21:32:11 [INFO] [ForgeModLoader] Java is Java HotSpot™ Client VM, version 1.6.0_41, running on Mac OS X:i386:10.6.8, installed at /System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home
2013-06-01 21:32:11 [FINE] [ForgeModLoader] Java classpath at launch is /Users/belle_wood/Desktop/Minecraft.app/Contents/Resources/Java/MinecraftLauncher.jar:
2013-06-01 21:32:11 [FINE] [ForgeModLoader] Java library path at launch is /Users/belle_wood/Desktop/Minecraft.app/Contents/Resources/Java:/System/Library/PrivateFrameworks/JavaApplicationLauncher.framework/Resources:.:/Library/Java/Extensions:/System/Library/Java/Extensions:/usr/lib/java
2013-06-01 21:32:11 [FINE] [ForgeModLoader] Enabling runtime deobfuscation
2013-06-01 21:32:17 [INFO] [STDERR] Exception in thread "Thread-7" java.lang.RuntimeException: java.lang.NoClassDefFoundError: cpw/mods/fml/relauncher/IFMLLoadingPlugin
2013-06-01 21:32:17 [INFO] [STDERR] at cpw.mods.fml.relauncher.FMLRelauncher.setupHome(FMLRelauncher.java:192)
2013-06-01 21:32:17 [INFO] [STDERR] at cpw.mods.fml.relauncher.FMLRelauncher.relaunchApplet(FMLRelauncher.java:259)
2013-06-01 21:32:17 [INFO] [STDERR] at cpw.mods.fml.relauncher.FMLRelauncher.appletEntry(FMLRelauncher.java:229)
2013-06-01 21:32:17 [INFO] [STDERR] at net.minecraft.client.MinecraftApplet.init(MinecraftApplet.java:25)
2013-06-01 21:32:17 [INFO] [STDERR] at net.minecraft.Launcher.replace(Launcher.java:143)
2013-06-01 21:32:17 [INFO] [STDERR] at net.minecraft.Launcher$1.run(Launcher.java:87)
2013-06-01 21:32:17 [INFO] [STDERR] Caused by: java.lang.NoClassDefFoundError: cpw/mods/fml/relauncher/IFMLLoadingPlugin
2013-06-01 21:32:17 [INFO] [STDERR] at java.lang.ClassLoader.defineClass1(Native Method)
2013-06-01 21:32:17 [INFO] [STDERR] at java.lang.ClassLoader.defineClassCond(ClassLoader.java:631)
2013-06-01 21:32:17 [INFO] [STDERR] at java.lang.ClassLoader.defineClass(ClassLoader.java:615)
2013-06-01 21:32:17 [INFO] [STDERR] at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141)
2013-06-01 21:32:17 [INFO] [STDERR] at java.net.URLClassLoader.defineClass(URLClassLoader.java:283)
2013-06-01 21:32:17 [INFO] [STDERR] at java.net.URLClassLoader.access$000(URLClassLoader.java:58)
2013-06-01 21:32:17 [INFO] [STDERR] at java.net.URLClassLoader$1.run(URLClassLoader.java:197)
2013-06-01 21:32:17 [INFO] [STDERR] at java.security.AccessController.doPrivileged(Native Method)
2013-06-01 21:32:17 [INFO] [STDERR] at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
2013-06-01 21:32:17 [INFO] [STDERR] at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
2013-06-01 21:32:17 [INFO] [STDERR] at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
2013-06-01 21:32:17 [INFO] [STDERR] at cpw.mods.fml.relauncher.RelaunchClassLoader.findClass(RelaunchClassLoader.java:145)
2013-06-01 21:32:17 [INFO] [STDERR] at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
2013-06-01 21:32:17 [INFO] [STDERR] at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
2013-06-01 21:32:17 [INFO] [STDERR] at java.lang.Class.forName0(Native Method)
2013-06-01 21:32:17 [INFO] [STDERR] at java.lang.Class.forName(Class.java:249)
2013-06-01 21:32:17 [INFO] [STDERR] at cpw.mods.fml.relauncher.RelaunchLibraryManager.handleLaunch(RelaunchLibraryManager.java:80)
2013-06-01 21:32:17 [INFO] [STDERR] at cpw.mods.fml.relauncher.FMLRelauncher.setupHome(FMLRelauncher.java:172)
2013-06-01 21:32:17 [INFO] [STDERR] ... 5 more
2013-06-01 21:32:17 [INFO] [STDERR] Caused by: java.lang.ClassNotFoundException: cpw.mods.fml.relauncher.IFMLLoadingPlugin
2013-06-01 21:32:17 [INFO] [STDERR] at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
2013-06-01 21:32:17 [INFO] [STDERR] at java.security.AccessController.doPrivileged(Native Method)
2013-06-01 21:32:17 [INFO] [STDERR] at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
2013-06-01 21:32:17 [INFO] [STDERR] at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
2013-06-01 21:32:17 [INFO] [STDERR] at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
2013-06-01 21:32:17 [INFO] [STDERR] ... 23 more

Any mods I need to uninstall, or IDs need tweaking? I'm on a Mac OSX Version 10.6.8 if that helps.

I'm not fully sure but i believe that Somnia is not for 1.5.2 and Backtools may require Ichun util

Thanks, I'll deinstall backtools. Somnia started this, **** somnia. Edit: Back tools isnt doing anything :P.