Hi guys...I need a little help here.....I my mistake I made my Minecraft be the 1.5.1 and for this I needed to put the new version of the Forge...but when I do the process everytime I get this little bug can you guys help me please?

 

And the log says:

 

2013-03-30 01:59:24 [iNFO] [ForgeModLoader] Forge Mod Loader version 5.1.8.611 for Minecraft 1.5.1 loading

2013-03-30 01:59:24 [iNFO] [ForgeModLoader] Java is Java HotSpot Client VM, version 1.7.0_17, running on Windows Vista:x86:6.0, installed at C:\Program Files\Java\jre7

2013-03-30 01:59:24 [FINE] [ForgeModLoader] Java classpath at launch is /C:/Users/adm/AppData/Local/Temp/e4j8207.tmp_dir/MinecraftSP.jar

2013-03-30 01:59:24 [FINE] [ForgeModLoader] Java library path at launch is C:\Windows\system32;C:\Windows\Sun\Java\bin;C:\Windows\system32;C:\Windows;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Program Files\QuickTime\QTSystem\;C:\Windows\System32\WindowsPowerShell\v1.0\;;C:\Program Files\Common Files\Nero\Lib\;c:\program files\java\jre7\bin;.

2013-03-30 01:59:24 [FINE] [ForgeModLoader] Enabling runtime deobfuscation

2013-03-30 01:59:24 [FINEST] [ForgeModLoader] All core mods are successfully located

2013-03-30 01:59:24 [FINEST] [ForgeModLoader] Discovering coremods

2013-03-30 01:59:24 [FINEST] [ForgeModLoader] Found library file argo-small-3.2.jar present and correct in lib dir

2013-03-30 01:59:24 [FINEST] [ForgeModLoader] Downloading file http://files.minecraftforge.net/fmllibs/guava-14.0-rc3.jar

2013-03-30 01:59:24 [iNFO] [ForgeModLoader] Downloading file http://files.minecraftforge.net/fmllibs/guava-14.0-rc3.jar

2013-03-30 01:59:30 [FINEST] [ForgeModLoader] Download complete

2013-03-30 01:59:30 [iNFO] [ForgeModLoader] Download complete

2013-03-30 01:59:30 [FINEST] [ForgeModLoader] Library file guava-14.0-rc3.jar was downloaded and verified successfully

2013-03-30 01:59:30 [FINEST] [ForgeModLoader] Found library file asm-all-4.1.jar present and correct in lib dir

2013-03-30 01:59:30 [FINEST] [ForgeModLoader] Found library file bcprov-jdk15on-148.jar present and correct in lib dir

2013-03-30 01:59:30 [FINEST] [ForgeModLoader] Found library file deobfuscation_data_1.5.1.zip present and correct in lib dir

2013-03-30 01:59:30 [FINEST] [ForgeModLoader] Found library file scala-library.jar present and correct in lib dir

2013-03-30 02:05:07 [iNFO] [sTDERR] Exception in thread "Thread-2" java.lang.RuntimeException: java.lang.NoClassDefFoundError: com/google/common/collect/Multimap

2013-03-30 02:05:07 [iNFO] [sTDERR] at cpw.mods.fml.relauncher.FMLRelauncher.setupHome(FMLRelauncher.java:192)

2013-03-30 02:05:07 [iNFO] [sTDERR] at cpw.mods.fml.relauncher.FMLRelauncher.relaunchApplet(FMLRelauncher.java:259)

2013-03-30 02:05:07 [iNFO] [sTDERR] at cpw.mods.fml.relauncher.FMLRelauncher.appletEntry(FMLRelauncher.java:229)

2013-03-30 02:05:07 [iNFO] [sTDERR] at net.minecraft.client.MinecraftApplet.init(MinecraftApplet.java:25)

2013-03-30 02:05:07 [iNFO] [sTDERR] at net.minecraft.Launcher.replace(Launcher.java:153)

2013-03-30 02:05:07 [iNFO] [sTDERR] at net.minecraft.Launcher$1.run(Launcher.java:94)

2013-03-30 02:05:07 [iNFO] [sTDERR] Caused by: java.lang.NoClassDefFoundError: com/google/common/collect/Multimap

2013-03-30 02:05:07 [iNFO] [sTDERR] at java.lang.Class.getDeclaredConstructors0(Native Method)

2013-03-30 02:05:07 [iNFO] [sTDERR] at java.lang.Class.privateGetDeclaredConstructors(Unknown Source)

2013-03-30 02:05:07 [iNFO] [sTDERR] at java.lang.Class.getConstructor0(Unknown Source)

2013-03-30 02:05:07 [iNFO] [sTDERR] at java.lang.Class.newInstance0(Unknown Source)

2013-03-30 02:05:07 [iNFO] [sTDERR] at java.lang.Class.newInstance(Unknown Source)

2013-03-30 02:05:07 [iNFO] [sTDERR] at cpw.mods.fml.relauncher.RelaunchClassLoader.registerTransformer(RelaunchClassLoader.java:96)

2013-03-30 02:05:07 [iNFO] [sTDERR] at cpw.mods.fml.relauncher.RelaunchLibraryManager.handleLaunch(RelaunchLibraryManager.java:271)

2013-03-30 02:05:07 [iNFO] [sTDERR] at cpw.mods.fml.relauncher.FMLRelauncher.setupHome(FMLRelauncher.java:172)

2013-03-30 02:05:07 [iNFO] [sTDERR] ... 5 more

2013-03-30 02:05:07 [iNFO] [sTDERR] Caused by: java.lang.ClassNotFoundException: com.google.common.collect.Multimap

2013-03-30 02:05:07 [iNFO] [sTDERR] at java.net.URLClassLoader$1.run(Unknown Source)

2013-03-30 02:05:07 [iNFO] [sTDERR] at java.net.URLClassLoader$1.run(Unknown Source)

2013-03-30 02:05:07 [iNFO] [sTDERR] at java.security.AccessController.doPrivileged(Native Method)

2013-03-30 02:05:07 [iNFO] [sTDERR] at java.net.URLClassLoader.findClass(Unknown Source)

2013-03-30 02:05:07 [iNFO] [sTDERR] at cpw.mods.fml.relauncher.RelaunchClassLoader.findClass(RelaunchClassLoader.java:134)

2013-03-30 02:05:07 [iNFO] [sTDERR] at java.lang.ClassLoader.loadClass(Unknown Source)

2013-03-30 02:05:07 [iNFO] [sTDERR] at java.lang.ClassLoader.loadClass(Unknown Source)

2013-03-30 02:05:07 [iNFO] [sTDERR] ... 13 more

 

 

i have the same problem

Read the EAQ.

 

So i went to EAQ and i download the ''fml_libs'' that said this could fix the problem.......but nothing yet...i still have the same problem

Use http://files.minecraftforge.net/fmllibs/fml_libs15.zip

 

Sorry! I did a mistake when i put the files! Now is ok! real thanks