Помогите Проблема с Forge Mod Loader

У меня работает клиент с форджем,а у моего друга - почему-то нет.Вот лог клиента
2013-05-27 19:43:52 [INFO] [ForgeModLoader] Forge Mod Loader version 5.1.8.611 for Minecraft 1.5.1 loading
2013-05-27 19:43:52 [INFO] [ForgeModLoader] Java is Java HotSpot(TM) Client VM, version 1.7.0_21, running on Windows 8:x86:6.2, installed at C:\Program Files (x86)\Java\jre7
2013-05-27 19:43:52 [FINE] [ForgeModLoader] Java classpath at launch is /C:/Users/Андрій/Desktop/launcher.exe
2013-05-27 19:43:52 [FINE] [ForgeModLoader] Java library path at launch is C:\Windows\SysWOW64;C:\Windows\Sun\Java\bin;C:\Windows\system32;C:\Windows;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Program Files (x86)\ATI Technologies\ATI.ACE\Core-Static;.
2013-05-27 19:43:52 [FINE] [ForgeModLoader] Enabling runtime deobfuscation
2013-05-27 19:43:52 [FINEST] [ForgeModLoader] All core mods are successfully located
2013-05-27 19:43:52 [FINEST] [ForgeModLoader] Discovering coremods
2013-05-27 19:43:52 [FINEST] [ForgeModLoader] Downloading file http://files.minecraftforge.net/fmllibs/argo-small-3.2.jar
2013-05-27 19:43:52 [INFO] [ForgeModLoader] Downloading file http://files.minecraftforge.net/fmllibs/argo-small-3.2.jar
2013-05-27 19:43:54 [FINEST] [ForgeModLoader] Download complete
2013-05-27 19:43:54 [INFO] [ForgeModLoader] Download complete
2013-05-27 19:43:54 [FINEST] [ForgeModLoader] Library file argo-small-3.2.jar was downloaded and verified successfully
2013-05-27 19:43:54 [FINEST] [ForgeModLoader] Downloading file http://files.minecraftforge.net/fmllibs/guava-14.0-rc3.jar
2013-05-27 19:43:54 [INFO] [ForgeModLoader] Downloading file http://files.minecraftforge.net/fmllibs/guava-14.0-rc3.jar
2013-05-27 19:44:15 [FINEST] [ForgeModLoader] Download complete
2013-05-27 19:44:15 [INFO] [ForgeModLoader] Download complete
2013-05-27 19:44:15 [FINEST] [ForgeModLoader] Library file guava-14.0-rc3.jar was downloaded and verified successfully
2013-05-27 19:44:15 [FINEST] [ForgeModLoader] Downloading file http://files.minecraftforge.net/fmllibs/asm-all-4.1.jar
2013-05-27 19:44:15 [INFO] [ForgeModLoader] Downloading file http://files.minecraftforge.net/fmllibs/asm-all-4.1.jar
2013-05-27 19:44:18 [FINEST] [ForgeModLoader] Download complete
2013-05-27 19:44:18 [INFO] [ForgeModLoader] Download complete
2013-05-27 19:44:18 [FINEST] [ForgeModLoader] Library file asm-all-4.1.jar was downloaded and verified successfully
2013-05-27 19:44:18 [FINEST] [ForgeModLoader] Downloading file http://files.minecraftforge.net/fmllibs/bcprov-jdk15on-148.jar
2013-05-27 19:44:18 [INFO] [ForgeModLoader] Downloading file http://files.minecraftforge.net/fmllibs/bcprov-jdk15on-148.jar
2013-05-27 19:44:44 [FINEST] [ForgeModLoader] Download complete
2013-05-27 19:44:44 [INFO] [ForgeModLoader] Download complete
2013-05-27 19:44:44 [FINEST] [ForgeModLoader] Library file bcprov-jdk15on-148.jar was downloaded and verified successfully
2013-05-27 19:44:44 [FINEST] [ForgeModLoader] Downloading file http://files.minecraftforge.net/fmllibs/deobfuscation_data_1.5.1.zip
2013-05-27 19:44:44 [INFO] [ForgeModLoader] Downloading file http://files.minecraftforge.net/fmllibs/deobfuscation_data_1.5.1.zip
2013-05-27 19:44:48 [FINEST] [ForgeModLoader] Download complete
2013-05-27 19:44:48 [INFO] [ForgeModLoader] Download complete
2013-05-27 19:44:48 [FINEST] [ForgeModLoader] Library file deobfuscation_data_1.5.1.zip was downloaded and verified successfully
2013-05-27 19:44:48 [FINEST] [ForgeModLoader] Downloading file http://files.minecraftforge.net/fmllibs/scala-library.jar
2013-05-27 19:44:48 [INFO] [ForgeModLoader] Downloading file http://files.minecraftforge.net/fmllibs/scala-library.jar
2013-05-27 19:45:13 [FINEST] [ForgeModLoader] Download complete
2013-05-27 19:45:13 [INFO] [ForgeModLoader] Download complete
2013-05-27 19:45:13 [FINEST] [ForgeModLoader] Library file scala-library.jar was downloaded and verified successfully
2013-05-27 19:45:43 [INFO] [STDERR] Exception in thread "Thread-4" java.lang.RuntimeException: java.lang.NoClassDefFoundError: com/google/common/collect/Multimap
2013-05-27 19:45:43 [INFO] [STDERR]at cpw.mods.fml.relauncher.FMLRelauncher.setupHome(FMLRelauncher.java:192)
2013-05-27 19:45:43 [INFO] [STDERR]at cpw.mods.fml.relauncher.FMLRelauncher.relaunchApplet(FMLRelauncher.java:259)
2013-05-27 19:45:43 [INFO] [STDERR]at cpw.mods.fml.relauncher.FMLRelauncher.appletEntry(FMLRelauncher.java:229)
2013-05-27 19:45:43 [INFO] [STDERR]at net.minecraft.client.MinecraftApplet.init(MinecraftApplet.java:25)
2013-05-27 19:45:43 [INFO] [STDERR]at net.minecraft.Launcher.replace(Launcher.java:143)
2013-05-27 19:45:43 [INFO] [STDERR]at net.minecraft.Launcher$1.run(Launcher.java:87)
2013-05-27 19:45:43 [INFO] [STDERR] Caused by: java.lang.NoClassDefFoundError: com/google/common/collect/Multimap
2013-05-27 19:45:43 [INFO] [STDERR]at java.lang.Class.getDeclaredConstructors0(Native Method)
2013-05-27 19:45:43 [INFO] [STDERR]at java.lang.Class.privateGetDeclaredConstructors(Unknown Source)
2013-05-27 19:45:43 [INFO] [STDERR]at java.lang.Class.getConstructor0(Unknown Source)
2013-05-27 19:45:43 [INFO] [STDERR]at java.lang.Class.newInstance0(Unknown Source)
2013-05-27 19:45:43 [INFO] [STDERR]at java.lang.Class.newInstance(Unknown Source)
2013-05-27 19:45:43 [INFO] [STDERR]at cpw.mods.fml.relauncher.RelaunchClassLoader.registerTransformer(RelaunchClassLoader.java:96)
2013-05-27 19:45:43 [INFO] [STDERR]at cpw.mods.fml.relauncher.RelaunchLibraryManager.handleLaunch(RelaunchLibraryManager.java:271)
2013-05-27 19:45:43 [INFO] [STDERR]at cpw.mods.fml.relauncher.FMLRelauncher.setupHome(FMLRelauncher.java:172)
2013-05-27 19:45:43 [INFO] [STDERR]... 5 more
2013-05-27 19:45:43 [INFO] [STDERR] Caused by: java.lang.ClassNotFoundException: com.google.common.collect.Multimap
2013-05-27 19:45:43 [INFO] [STDERR]at java.net.URLClassLoader$1.run(Unknown Source)
2013-05-27 19:45:43 [INFO] [STDERR]at java.net.URLClassLoader$1.run(Unknown Source)
2013-05-27 19:45:43 [INFO] [STDERR]at java.security.AccessController.doPrivileged(Native Method)
2013-05-27 19:45:43 [INFO] [STDERR]at java.net.URLClassLoader.findClass(Unknown Source)
2013-05-27 19:45:43 [INFO] [STDERR]at cpw.mods.fml.relauncher.RelaunchClassLoader.findClass(RelaunchClassLoader.java:134)
2013-05-27 19:45:43 [INFO] [STDERR]at java.lang.ClassLoader.loadClass(Unknown Source)
2013-05-27 19:45:43 [INFO] [STDERR]at java.lang.ClassLoader.loadClass(Unknown Source)
2013-05-27 19:45:43 [INFO] [STDERR]... 13 more