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I tried to download forge 1.5 and I'm sure it's the most recent version however i get the message that there was a fatal error. I looked into the ForgeModLoader Client log 0 thing, and here is the message.

 

2013-03-13 14:57:15 [iNFO] [ForgeModLoader] Forge Mod Loader version 5.0.24.582 for Minecraft 1.5 loading

2013-03-13 14:57:15 [FINE] [ForgeModLoader] Enabling runtime deobfuscation

2013-03-13 14:57:15 [FINEST] [ForgeModLoader] All core mods are successfully located

2013-03-13 14:57:15 [FINEST] [ForgeModLoader] Discovering coremods

2013-03-13 14:57:15 [FINEST] [ForgeModLoader] Found a candidate coremod CodeChickenCore 0.7.3.jar

2013-03-13 14:57:15 [FINEST] [ForgeModLoader] Loading coremod CodeChickenCore 0.7.3.jar

2013-03-13 14:57:15 [FINEST] [ForgeModLoader] Loaded coremod CodeChickenCore 0.7.3.jar

2013-03-13 14:57:15 [FINEST] [ForgeModLoader] Found a candidate coremod NotEnoughItems 1.4.7.0.jar

2013-03-13 14:57:15 [FINEST] [ForgeModLoader] Loading coremod NotEnoughItems 1.4.7.0.jar

2013-03-13 14:57:15 [FINEST] [ForgeModLoader] Loaded coremod NotEnoughItems 1.4.7.0.jar

2013-03-13 14:57:15 [FINEST] [ForgeModLoader] Found library file argo-small-3.2.jar present and correct in lib dir

2013-03-13 14:57:16 [FINEST] [ForgeModLoader] Found library file guava-14.0-rc3.jar present and correct in lib dir

2013-03-13 14:57:16 [FINEST] [ForgeModLoader] Found library file asm-all-4.1.jar present and correct in lib dir

2013-03-13 14:57:16 [FINEST] [ForgeModLoader] Found library file bcprov-jdk15on-148.jar present and correct in lib dir

2013-03-13 14:57:16 [FINEST] [ForgeModLoader] Found library file deobfuscation_data_1.5.zip present and correct in lib dir

2013-03-13 14:57:16 [FINEST] [ForgeModLoader] Found library file scala-library.jar present and correct in lib dir

2013-03-13 14:57:20 [iNFO] [sTDERR] Exception in thread "Thread-5" java.lang.RuntimeException: java.lang.NoClassDefFoundError: cpw/mods/fml/common/asm/ASMTransformer

2013-03-13 14:57:20 [iNFO] [sTDERR] at cpw.mods.fml.relauncher.FMLRelauncher.setupHome(FMLRelauncher.java:189)

2013-03-13 14:57:20 [iNFO] [sTDERR] at cpw.mods.fml.relauncher.FMLRelauncher.relaunchApplet(FMLRelauncher.java:256)

2013-03-13 14:57:20 [iNFO] [sTDERR] at cpw.mods.fml.relauncher.FMLRelauncher.appletEntry(FMLRelauncher.java:226)

2013-03-13 14:57:20 [iNFO] [sTDERR] at net.minecraft.client.MinecraftApplet.init(MinecraftApplet.java:25)

2013-03-13 14:57:20 [iNFO] [sTDERR] at net.minecraft.Launcher.replace(Launcher.java:136)

2013-03-13 14:57:20 [iNFO] [sTDERR] at net.minecraft.Launcher$1.run(Launcher.java:79)

2013-03-13 14:57:20 [iNFO] [sTDERR] Caused by: java.lang.NoClassDefFoundError: cpw/mods/fml/common/asm/ASMTransformer

2013-03-13 14:57:20 [iNFO] [sTDERR] at java.lang.ClassLoader.defineClass1(Native Method)

2013-03-13 14:57:20 [iNFO] [sTDERR] at java.lang.ClassLoader.defineClass(Unknown Source)

2013-03-13 14:57:20 [iNFO] [sTDERR] at java.security.SecureClassLoader.defineClass(Unknown Source)

2013-03-13 14:57:20 [iNFO] [sTDERR] at java.net.URLClassLoader.defineClass(Unknown Source)

2013-03-13 14:57:20 [iNFO] [sTDERR] at java.net.URLClassLoader.access$100(Unknown Source)

2013-03-13 14:57:20 [iNFO] [sTDERR] at java.net.URLClassLoader$1.run(Unknown Source)

2013-03-13 14:57:20 [iNFO] [sTDERR] at java.net.URLClassLoader$1.run(Unknown Source)

2013-03-13 14:57:20 [iNFO] [sTDERR] at java.security.AccessController.doPrivileged(Native Method)

2013-03-13 14:57:20 [iNFO] [sTDERR] at java.net.URLClassLoader.findClass(Unknown Source)

2013-03-13 14:57:20 [iNFO] [sTDERR] at cpw.mods.fml.relauncher.RelaunchClassLoader.findClass(RelaunchClassLoader.java:133)

2013-03-13 14:57:20 [iNFO] [sTDERR] at java.lang.ClassLoader.loadClass(Unknown Source)

2013-03-13 14:57:20 [iNFO] [sTDERR] at java.lang.ClassLoader.loadClass(Unknown Source)

2013-03-13 14:57:20 [iNFO] [sTDERR] at cpw.mods.fml.relauncher.RelaunchClassLoader.registerTransformer(RelaunchClassLoader.java:95)

2013-03-13 14:57:20 [iNFO] [sTDERR] at cpw.mods.fml.relauncher.RelaunchLibraryManager.handleLaunch(RelaunchLibraryManager.java:270)

2013-03-13 14:57:20 [iNFO] [sTDERR] at cpw.mods.fml.relauncher.FMLRelauncher.setupHome(FMLRelauncher.java:169)

2013-03-13 14:57:20 [iNFO] [sTDERR] ... 5 more

2013-03-13 14:57:20 [iNFO] [sTDERR] Caused by: java.lang.ClassNotFoundException: cpw.mods.fml.common.asm.ASMTransformer

2013-03-13 14:57:20 [iNFO] [sTDERR] at cpw.mods.fml.relauncher.RelaunchClassLoader.findClass(RelaunchClassLoader.java:210)

2013-03-13 14:57:20 [iNFO] [sTDERR] at java.lang.ClassLoader.loadClass(Unknown Source)

2013-03-13 14:57:20 [iNFO] [sTDERR] at java.lang.ClassLoader.loadClass(Unknown Source)

2013-03-13 14:57:20 [iNFO] [sTDERR] ... 20 more

2013-03-13 14:57:20 [iNFO] [sTDERR] Caused by: java.lang.NoClassDefFoundError: net/minecraftforge/event/Event

2013-03-13 14:57:20 [iNFO] [sTDERR] at net.minecraftforge.transformers.EventTransformer.buildEvents(EventTransformer.java:59)

2013-03-13 14:57:20 [iNFO] [sTDERR] at net.minecraftforge.transformers.EventTransformer.transform(EventTransformer.java:35)

2013-03-13 14:57:20 [iNFO] [sTDERR] at cpw.mods.fml.relauncher.RelaunchClassLoader.runTransformers(RelaunchClassLoader.java:277)

2013-03-13 14:57:20 [iNFO] [sTDERR] at cpw.mods.fml.relauncher.RelaunchClassLoader.findClass(RelaunchClassLoader.java:198)

2013-03-13 14:57:20 [iNFO] [sTDERR] ... 22 more

2013-03-13 14:57:20 [iNFO] [sTDERR] Caused by: java.lang.ClassNotFoundException: net.minecraftforge.event.Event

2013-03-13 14:57:20 [iNFO] [sTDERR] at cpw.mods.fml.relauncher.RelaunchClassLoader.findClass(RelaunchClassLoader.java:210)

2013-03-13 14:57:20 [iNFO] [sTDERR] at java.lang.ClassLoader.loadClass(Unknown Source)

2013-03-13 14:57:20 [iNFO] [sTDERR] at java.lang.ClassLoader.loadClass(Unknown Source)

2013-03-13 14:57:20 [iNFO] [sTDERR] ... 26 more

2013-03-13 14:57:20 [iNFO] [sTDERR] Caused by: java.lang.AbstractMethodError

2013-03-13 14:57:20 [iNFO] [sTDERR] at cpw.mods.fml.relauncher.RelaunchClassLoader.runTransformers(RelaunchClassLoader.java:277)

2013-03-13 14:57:20 [iNFO] [sTDERR] at cpw.mods.fml.relauncher.RelaunchClassLoader.findClass(RelaunchClassLoader.java:198)

2013-03-13 14:57:20 [iNFO] [sTDERR] ... 28 more

 

That's typically caused when you've failed to install all of the forge class files. Namely net/minecraftforge/event/Event.class

I do Forge for free, however the servers to run it arn't free, so anything is appreciated.
Consider supporting the team on Patreon

  • Author

That's typically caused when you've failed to install all of the forge class files. Namely net/minecraftforge/event/Event.class

So what am I supposed to do? I forced updated and reinstalled it but nothing changed.

Having the same problem and I even downloaded and force updated about 5 times.  And I uninstalled java and reinstalled java but, still no change and now forge wont even work with Magic Launcher

Is the net/minecraftforge/event/Event.class file even in your Forge zip?

Read the EAQ before posting! OR ELSE!

 

This isn't building better software, its trying to grab a place in the commit list of a highly visible github project.

 

www.forgeessentials.com

 

Don't PM me, I don't check this account unless I have to.

Actually reading the log more this is because you forgot to clean your damn coremods folder -.-

I do Forge for free, however the servers to run it arn't free, so anything is appreciated.
Consider supporting the team on Patreon

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