I'm on a mac.When i download forge version 9.11.1.935 (latest?) and then open it,it opens a blank window labeled "Mod system installer". I can't get rid of the window except by force quitting,and i can't click the "OK" button either. I have tried different versions,too. But still the same problem.

 

Anybody got any idea of what's going on?

i have the exact same problem what do we do

Have you tried updating to Mavericks (10.9, look in the App Store) and Java 7?

Get us a console log.

 

2013-10-11 18:16:32 [sEVERE] [ForgeModLoader] Error details

java.lang.RuntimeException: A download error occured

at cpw.mods.fml.relauncher.RelaunchLibraryManager.downloadFile(RelaunchLibraryManager.java:548)

at cpw.mods.fml.relauncher.RelaunchLibraryManager.handleLaunch(RelaunchLibraryManager.java:165)

at cpw.mods.fml.relauncher.FMLRelauncher.setupHome(FMLRelauncher.java:172)

at cpw.mods.fml.relauncher.FMLRelauncher.relaunchApplet(FMLRelauncher.java:259)

at cpw.mods.fml.relauncher.FMLRelauncher.appletEntry(FMLRelauncher.java:229)

at net.minecraft.client.MinecraftApplet.init(MinecraftApplet.java:25)

at net.minecraft.Launcher.init(Launcher.java:85)

at net.ftb.mclauncher.MinecraftFrame.start(MinecraftFrame.java:149)

at net.ftb.mclauncher.MinecraftLauncher.main(MinecraftLauncher.java:211)

Caused by: java.io.FileNotFoundException: http://files.minecraftforge.net/fmllibs/scala-library.jar

at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)

at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)

at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)

at java.lang.reflect.Constructor.newInstance(Constructor.java:513)

at sun.net.www.protocol.http.HttpURLConnection$6.run(HttpURLConnection.java:1491)

at java.security.AccessController.doPrivileged(Native Method)

at sun.net.www.protocol.http.HttpURLConnection.getChainedException(HttpURLConnection.java:1485)

at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1139)

at cpw.mods.fml.relauncher.RelaunchLibraryManager.downloadFile(RelaunchLibraryManager.java:532)

... 8 more

Caused by: java.io.FileNotFoundException: http://files.minecraftforge.net/fmllibs/scala-library.jar

at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1434)

at sun.net.www.protocol.http.HttpURLConnection.getHeaderField(HttpURLConnection.java:2300)

at java.net.URLConnection.getHeaderFieldInt(URLConnection.java:579)

at java.net.URLConnection.getContentLength(URLConnection.java:474)

at cpw.mods.fml.relauncher.RelaunchLibraryManager.downloadFile(RelaunchLibraryManager.java:531)

... 8 more

2013-10-11 18:16:53 [iNFO] [sTDERR] [18:16:53] [ERROR] FMLRelauncher.setupHome:192->MinecraftLauncher.main:217: Unhandled error launching minecraft: java.lang.RuntimeException: java.lang.RuntimeException: A fatal error occured and FML cannot continue

2013-10-11 18:16:53 [iNFO] [sTDERR] cpw.mods.fml.relauncher.FMLRelauncher.setupHome(FMLRelauncher.java:192)

2013-10-11 18:16:53 [iNFO] [sTDERR] cpw.mods.fml.relauncher.FMLRelauncher.relaunchApplet(FMLRelauncher.java:259)

2013-10-11 18:16:53 [iNFO] [sTDERR] cpw.mods.fml.relauncher.FMLRelauncher.appletEntry(FMLRelauncher.java:229)

2013-10-11 18:16:53 [iNFO] [sTDERR] net.minecraft.client.MinecraftApplet.init(MinecraftApplet.java:25)

2013-10-11 18:16:53 [iNFO] [sTDERR] net.minecraft.Launcher.init(Launcher.java:85)

2013-10-11 18:16:53 [iNFO] [sTDERR] net.ftb.mclauncher.MinecraftFrame.start(MinecraftFrame.java:149)

2013-10-11 18:16:53 [iNFO] [sTDERR] net.ftb.mclauncher.MinecraftLauncher.main(MinecraftLauncher.java:211)

 

 

 

Edit: IT'S ALIVE! IT WORKS!…I don't know why,but it works now.