I am using minecraft forge 1.5.7.7.0.5.8.2. I have also tried 1.5.7.7.0.5.8.3 It acts like it is loading, then tells me there has been a fatal error. Both times I get an identical error report. I am running minecraft version 1.5. Forge is the only mod I am currently using, I have not added in any others.

 

 

 

*** MagicMinecraftLauncher 1.0.0 ***

Disable inactive mods

2013-03-14 23:30:03 [iNFO] [ForgeModLoader] Forge Mod Loader version 5.0.25.583 for Minecraft 1.5 loading

2013-03-14 23:30:03 [sEVERE] [ForgeModLoader] A critical problem occured registering the ASM transformer class cpw.mods.fml.common.asm.transformers.DeobfuscationTransformer

java.lang.ClassNotFoundException: cpw.mods.fml.common.asm.transformers.DeobfuscationTransformer

    at cpw.mods.fml.relauncher.RelaunchClassLoader.findClass(RelaunchClassLoader.java:210)

    at java.lang.ClassLoader.loadClass(Unknown Source)

    at java.lang.ClassLoader.loadClass(Unknown Source)

    at cpw.mods.fml.relauncher.RelaunchClassLoader.registerTransformer(RelaunchClassLoader.java:95)

    at cpw.mods.fml.relauncher.RelaunchLibraryManager.handleLaunch(RelaunchLibraryManager.java:277)

    at cpw.mods.fml.relauncher.FMLRelauncher.setupHome(FMLRelauncher.java:169)

    at cpw.mods.fml.relauncher.FMLRelauncher.relaunchClient(FMLRelauncher.java:104)

    at cpw.mods.fml.relauncher.FMLRelauncher.handleClientRelaunch(FMLRelauncher.java:38)

    at net.minecraft.client.Minecraft.main(Minecraft.java:2227)

    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)

    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)

    at java.lang.reflect.Method.invoke(Unknown Source)

    at magic.launcher.Launcher.main(Unknown Source)

Caused by: java.lang.NoClassDefFoundError: net/minecraftforge/event/Event

    at net.minecraftforge.transformers.EventTransformer.buildEvents(EventTransformer.java:59)

    at net.minecraftforge.transformers.EventTransformer.transform(EventTransformer.java:35)

    at cpw.mods.fml.relauncher.RelaunchClassLoader.runTransformers(RelaunchClassLoader.java:277)

    at cpw.mods.fml.relauncher.RelaunchClassLoader.findClass(RelaunchClassLoader.java:198)

    ... 13 more

Caused by: java.lang.ClassNotFoundException: net.minecraftforge.event.Event

    at cpw.mods.fml.relauncher.RelaunchClassLoader.findClass(RelaunchClassLoader.java:210)

    at java.lang.ClassLoader.loadClass(Unknown Source)

    at java.lang.ClassLoader.loadClass(Unknown Source)

    ... 17 more

Caused by: java.lang.AbstractMethodError

    at cpw.mods.fml.relauncher.RelaunchClassLoader.runTransformers(RelaunchClassLoader.java:277)

    at cpw.mods.fml.relauncher.RelaunchClassLoader.findClass(RelaunchClassLoader.java:198)

    ... 19 more

2013-03-14 23:30:05 [iNFO] [sTDERR] java.lang.reflect.InvocationTargetException

2013-03-14 23:30:05 [iNFO] [sTDERR]    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

2013-03-14 23:30:05 [iNFO] [sTDERR]    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)

2013-03-14 23:30:05 [iNFO] [sTDERR]    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)

2013-03-14 23:30:05 [iNFO] [sTDERR]    at java.lang.reflect.Method.invoke(Unknown Source)

2013-03-14 23:30:05 [iNFO] [sTDERR]    at magic.launcher.Launcher.main(Unknown Source)

2013-03-14 23:30:05 [iNFO] [sTDERR] Caused by: java.lang.RuntimeException: java.lang.RuntimeException: java.lang.ClassNotFoundException: cpw.mods.fml.common.asm.FMLSanityChecker

2013-03-14 23:30:05 [iNFO] [sTDERR]    at cpw.mods.fml.relauncher.FMLRelauncher.setupHome(FMLRelauncher.java:189)

2013-03-14 23:30:05 [iNFO] [sTDERR]    at cpw.mods.fml.relauncher.FMLRelauncher.relaunchClient(FMLRelauncher.java:104)

2013-03-14 23:30:05 [iNFO] [sTDERR]    at cpw.mods.fml.relauncher.FMLRelauncher.handleClientRelaunch(FMLRelauncher.java:38)

2013-03-14 23:30:05 [iNFO] [sTDERR]    at net.minecraft.client.Minecraft.main(Minecraft.java:2227)

2013-03-14 23:30:05 [iNFO] [sTDERR]    ... 5 more

2013-03-14 23:30:05 [iNFO] [sTDERR] Caused by: java.lang.RuntimeException: java.lang.ClassNotFoundException: cpw.mods.fml.common.asm.FMLSanityChecker

2013-03-14 23:30:05 [iNFO] [sTDERR]    at cpw.mods.fml.relauncher.RelaunchLibraryManager.handleLaunch(RelaunchLibraryManager.java:305)

2013-03-14 23:30:05 [iNFO] [sTDERR]    at cpw.mods.fml.relauncher.FMLRelauncher.setupHome(FMLRelauncher.java:169)

2013-03-14 23:30:05 [iNFO] [sTDERR]    ... 8 more

2013-03-14 23:30:05 [iNFO] [sTDERR] Caused by: java.lang.ClassNotFoundException: cpw.mods.fml.common.asm.FMLSanityChecker

2013-03-14 23:30:05 [iNFO] [sTDERR]    at cpw.mods.fml.relauncher.RelaunchClassLoader.findClass(RelaunchClassLoader.java:210)

2013-03-14 23:30:05 [iNFO] [sTDERR]    at java.lang.ClassLoader.loadClass(Unknown Source)

2013-03-14 23:30:05 [iNFO] [sTDERR]    at java.lang.ClassLoader.loadClass(Unknown Source)

2013-03-14 23:30:05 [iNFO] [sTDERR]    at java.lang.Class.forName0(Native Method)

2013-03-14 23:30:05 [iNFO] [sTDERR]    at java.lang.Class.forName(Unknown Source)

2013-03-14 23:30:05 [iNFO] [sTDERR]    at cpw.mods.fml.relauncher.RelaunchLibraryManager.handleLaunch(RelaunchLibraryManager.java:294)

2013-03-14 23:30:05 [iNFO] [sTDERR]    ... 9 more

2013-03-14 23:30:05 [iNFO] [sTDERR] Caused by: java.lang.NoClassDefFoundError: net/minecraftforge/event/Event

2013-03-14 23:30:05 [iNFO] [sTDERR]    at net.minecraftforge.transformers.EventTransformer.buildEvents(EventTransformer.java:59)

2013-03-14 23:30:05 [iNFO] [sTDERR]    at net.minecraftforge.transformers.EventTransformer.transform(EventTransformer.java:35)

2013-03-14 23:30:05 [iNFO] [sTDERR]    at cpw.mods.fml.relauncher.RelaunchClassLoader.runTransformers(RelaunchClassLoader.java:277)

2013-03-14 23:30:05 [iNFO] [sTDERR]    at cpw.mods.fml.relauncher.RelaunchClassLoader.findClass(RelaunchClassLoader.java:198)

2013-03-14 23:30:05 [iNFO] [sTDERR]    ... 14 more

 

Seems like you missed some files from Forge during installing it. Get a new minecraft.jar, download the latest universal Forge again and install it correctly!

Thanks so much. I installed forge correctly, I guess there was just something wrong with my jar file. I didn't think about reinstalling it, so thanks for reminding me. It now works perfectly fine.