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Hey ! Thanks for your replies ! Ernio thks you very much, now FML download file in my folder !!! it's work ! but ... i have now a new bug and minecraft don't want to start ... 2013-04-16 19:37:49 [iNFO] [ForgeModLoader] Forge Mod Loader version 5.1.8.611 for Minecraft 1.5.1 loading 2013-04-16 19:37:49 [iNFO] [ForgeModLoader] Java is Java HotSpot(TM) 64-Bit Server VM, version 1.7.0_17, running on Windows 7:amd64:6.1, installed at C:\Program Files\Java\jre7 2013-04-16 19:37:49 [sEVERE] [ForgeModLoader] FML appears to be missing any signature data. This is not a good thing 2013-04-16 19:37:50 [iNFO] [sTDERR] Exception in thread "Thread-5" java.lang.RuntimeException: cpw.mods.fml.relauncher.ReflectionHelper$UnableToFindClassException: java.lang.ClassNotFoundException: net.minecraft.Launcher 2013-04-16 19:37:50 [iNFO] [sTDERR] at cpw.mods.fml.relauncher.FMLRelauncher.relaunchApplet(FMLRelauncher.java:287) 2013-04-16 19:37:50 [iNFO] [sTDERR] at cpw.mods.fml.relauncher.FMLRelauncher.appletEntry(FMLRelauncher.java:229) 2013-04-16 19:37:50 [iNFO] [sTDERR] at net.minecraft.client.MinecraftApplet.init(MinecraftApplet.java:25) 2013-04-16 19:37:50 [iNFO] [sTDERR] at edoriacraft.launcher.Launcher.replace(Launcher.java:146) 2013-04-16 19:37:50 [iNFO] [sTDERR] at edoriacraft.launcher.Launcher$1.run(Launcher.java:90) 2013-04-16 19:37:50 [iNFO] [sTDERR] Caused by: cpw.mods.fml.relauncher.ReflectionHelper$UnableToFindClassException: java.lang.ClassNotFoundException: net.minecraft.Launcher 2013-04-16 19:37:50 [iNFO] [sTDERR] at cpw.mods.fml.relauncher.ReflectionHelper.getClass(ReflectionHelper.java:159) 2013-04-16 19:37:50 [iNFO] [sTDERR] at cpw.mods.fml.relauncher.FMLRelauncher.relaunchApplet(FMLRelauncher.java:272) 2013-04-16 19:37:50 [iNFO] [sTDERR] ... 4 more 2013-04-16 19:37:50 [iNFO] [sTDERR] Caused by: java.lang.ClassNotFoundException: net.minecraft.Launcher 2013-04-16 19:37:50 [iNFO] [sTDERR] at java.net.URLClassLoader$1.run(Unknown Source) 2013-04-16 19:37:50 [iNFO] [sTDERR] at java.net.URLClassLoader$1.run(Unknown Source) 2013-04-16 19:37:50 [iNFO] [sTDERR] at java.security.AccessController.doPrivileged(Native Method) 2013-04-16 19:37:50 [iNFO] [sTDERR] at java.net.URLClassLoader.findClass(Unknown Source) 2013-04-16 19:37:50 [iNFO] [sTDERR] at java.lang.ClassLoader.loadClass(Unknown Source) 2013-04-16 19:37:50 [iNFO] [sTDERR] at java.lang.ClassLoader.loadClass(Unknown Source) 2013-04-16 19:37:50 [iNFO] [sTDERR] at java.lang.Class.forName0(Native Method) 2013-04-16 19:37:50 [iNFO] [sTDERR] at java.lang.Class.forName(Unknown Source) 2013-04-16 19:37:50 [iNFO] [sTDERR] at cpw.mods.fml.relauncher.ReflectionHelper.getClass(ReflectionHelper.java:151) 2013-04-16 19:37:50 [iNFO] [sTDERR] ... 5 more I thinks it is about my launcher, but i don't understand why i have this :'( I don't have any class "net.minecraft.Launcher", Is it the reason ? Thank you anyway for your help !

Hey ! Thanks for your replies ! Ernio thks you very much, now FML download file in my folder !!! it's work ! but ... i have now a new bug and minecraft don't want to start ... 2013-04-16 19:37:49 [iNFO] [ForgeModLoader] Forge Mod Loader version 5.1.8.611 for Minecraft 1.5.1 loading 2013-04-16 19:37:49 [iNFO] [ForgeModLoader] Java is Java HotSpot(TM) 64-Bit Server VM, version 1.7.0_17, running on Windows 7:amd64:6.1, installed at C:\Program Files\Java\jre7 2013-04-16 19:37:49 [sEVERE] [ForgeModLoader] FML appears to be missing any signature data. This is not a good thing 2013-04-16 19:37:50 [iNFO] [sTDERR] Exception in thread "Thread-5" java.lang.RuntimeException: cpw.mods.fml.relauncher.ReflectionHelper$UnableToFindClassException: java.lang.ClassNotFoundException: net.minecraft.Launcher 2013-04-16 19:37:50 [iNFO] [sTDERR] at cpw.mods.fml.relauncher.FMLRelauncher.relaunchApplet(FMLRelauncher.java:287) 2013-04-16 19:37:50 [iNFO] [sTDERR] at cpw.mods.fml.relauncher.FMLRelauncher.appletEntry(FMLRelauncher.java:229) 2013-04-16 19:37:50 [iNFO] [sTDERR] at net.minecraft.client.MinecraftApplet.init(MinecraftApplet.java:25) 2013-04-16 19:37:50 [iNFO] [sTDERR] at edoriacraft.launcher.Launcher.replace(Launcher.java:146) 2013-04-16 19:37:50 [iNFO] [sTDERR] at edoriacraft.launcher.Launcher$1.run(Launcher.java:90) 2013-04-16 19:37:50 [iNFO] [sTDERR] Caused by: cpw.mods.fml.relauncher.ReflectionHelper$UnableToFindClassException: java.lang.ClassNotFoundException: net.minecraft.Launcher 2013-04-16 19:37:50 [iNFO] [sTDERR] at cpw.mods.fml.relauncher.ReflectionHelper.getClass(ReflectionHelper.java:159) 2013-04-16 19:37:50 [iNFO] [sTDERR] at cpw.mods.fml.relauncher.FMLRelauncher.relaunchApplet(FMLRelauncher.java:272) 2013-04-16 19:37:50 [iNFO] [sTDERR] ... 4 more 2013-04-16 19:37:50 [iNFO] [sTDERR] Caused by: java.lang.ClassNotFoundException: net.minecraft.Launcher 2013-04-16 19:37:50 [iNFO] [sTDERR] at java.net.URLClassLoader$1.run(Unknown Source) 2013-04-16 19:37:50 [iNFO] [sTDERR] at java.net.URLClassLoader$1.run(Unknown Source) 2013-04-16 19:37:50 [iNFO] [sTDERR] at java.security.AccessController.doPrivileged(Native Method) 2013-04-16 19:37:50 [iNFO] [sTDERR] at java.net.URLClassLoader.findClass(Unknown Source) 2013-04-16 19:37:50 [iNFO] [sTDERR] at java.lang.ClassLoader.loadClass(Unknown Source) 2013-04-16 19:37:50 [iNFO] [sTDERR] at java.lang.ClassLoader.loadClass(Unknown Source) 2013-04-16 19:37:50 [iNFO] [sTDERR] at java.lang.Class.forName0(Native Method) 2013-04-16 19:37:50 [iNFO] [sTDERR] at java.lang.Class.forName(Unknown Source) 2013-04-16 19:37:50 [iNFO] [sTDERR] at cpw.mods.fml.relauncher.ReflectionHelper.getClass(ReflectionHelper.java:151) 2013-04-16 19:37:50 [iNFO] [sTDERR] ... 5 more I thinks it is about my launcher, but i don't understand why i have this :'( I don't have any class "net.minecraft.Launcher", Is it the reason ? Thank you anyway for your help !

Hello !!! So i will try to explain quickly my problem : I modify a java class in minecraft.jar to change the minecraft main directory, in net/minecraft/client/Minecraft.java at "minecraftDir = getAppDir("minecraft");" (just change minecraft to an other name) So my new minecraft start in a directory like ".test" in appdata . BUT : I have tried to add Forge mod loader (for Minecraft 1.5.1) in my minecraft.jar , but he delete my "Minecraft.java" :'( to replace it by his... conclusion : FML try to load my mods only in the ".minecraft" I download the FML'source, But impossible to find the "Minecraft.java" class I understood later that you use java.patch in mcp to ... patch ( ) the original minecraft java class . There is two interressants patchs : minecraftforge-src-1.5.1-7.7.1.611.zip\forge\patches\minecraft\net\minecraft\client\Minecraft.java.patch minecraftforge-src-1.5.1-7.7.1.611.zip\forge\fml\patches\minecraft\net\minecraft\client\Minecraft.java.patch [shadow=red,left]So : my question is :[/shadow] it is possible to add in one of this patch, the lines : - minecraftDir = getAppDir("minecraft"); + minecraftDir = getAppDir("OTHERNAME"); I think it is the only way to change this Parameter of minecraft with FML but if you have another idea, I would listen carefully you I already see a topic in the forum, but it didn't help me . (I also found this , similary problems) Thank you in advance for your help ! ps: I'm sorry, i'm a little (and beginner) french programmer, so my english is surely not good all the time