Ok so I was having this problem with Minecraft Forge and first It would load fine in the loading screen then an error occurred and after that i would always get a loading screen error I would try doing it to Minecraft over and over but it won't fix it..
Client Log
2013-05-09 23:09:52 [INFO] [ForgeModLoader] Forge Mod Loader version 5.2.2.684 for Minecraft 1.5.2 loading
2013-05-09 23:09:52 [INFO] [ForgeModLoader] Java is Java HotSpot(TM) Client VM, version 1.7.0_21, running on Windows Vista:x86:6.0, installed at C:\Program Files (x86)\Java\jre7
2013-05-09 23:09:52 [FINE] [ForgeModLoader] Java classpath at launch is /C:/Users/Pacetes/AppData/Local/Temp/e4jED00.tmp_dir/MinecraftSP.jar
2013-05-09 23:09:52 [FINE] [ForgeModLoader] Java library path at launch is C:\Windows\SysWOW64;C:\Windows\Sun\Java\bin;C:\Windows\system32;C:\Windows;C:\Program Files (x86)\AMD APP\bin\x86_64;C:\Program Files (x86)\AMD APP\bin\x86;C:\Program Files\Common Files\Microsoft Shared\Windows Live;C:\Program Files (x86)\Common Files\Microsoft Shared\Windows Live;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Program Files (x86)\Windows Live\Shared;C:\Program Files (x86)\ATI Technologies\ATI.ACE\Core-Static;c:\program files (x86)\java\jre7\bin;.
2013-05-09 23:09:52 [FINE] [ForgeModLoader] Enabling runtime deobfuscation
2013-05-09 23:09:52 [FINEST] [ForgeModLoader] All core mods are successfully located
2013-05-09 23:09:52 [FINEST] [ForgeModLoader] Discovering coremods
2013-05-09 23:09:52 [FINEST] [ForgeModLoader] Found library file argo-small-3.2.jar present and correct in lib dir
2013-05-09 23:09:52 [FINEST] [ForgeModLoader] Downloading file http://files.minecraftforge.net/fmllibs/guava-14.0-rc3.jar
2013-05-09 23:09:52 [INFO] [ForgeModLoader] Downloading file http://files.minecraftforge.net/fmllibs/guava-14.0-rc3.jar
2013-05-09 23:10:00 [SEVERE] [ForgeModLoader] There was a problem downloading the file guava-14.0-rc3.jar automatically. Perhaps you have an environment without internet access. You will need to download the file manually or restart and let it try again
2013-05-09 23:10:00 [FINEST] [ForgeModLoader] Downloading file http://files.minecraftforge.net/fmllibs/asm-all-4.1.jar
2013-05-09 23:10:00 [INFO] [ForgeModLoader] Downloading file http://files.minecraftforge.net/fmllibs/asm-all-4.1.jar
2013-05-09 23:10:03 [FINEST] [ForgeModLoader] Download complete
2013-05-09 23:10:03 [INFO] [ForgeModLoader] Download complete
2013-05-09 23:10:03 [FINEST] [ForgeModLoader] Library file asm-all-4.1.jar was downloaded and verified successfully
2013-05-09 23:10:03 [FINEST] [ForgeModLoader] Downloading file http://files.minecraftforge.net/fmllibs/bcprov-jdk15on-148.jar
2013-05-09 23:10:03 [INFO] [ForgeModLoader] Downloading file http://files.minecraftforge.net/fmllibs/bcprov-jdk15on-148.jar
2013-05-09 23:10:08 [SEVERE] [ForgeModLoader] There was a problem downloading the file bcprov-jdk15on-148.jar automatically. Perhaps you have an environment without internet access. You will need to download the file manually or restart and let it try again
2013-05-09 23:10:08 [FINEST] [ForgeModLoader] Found library file deobfuscation_data_1.5.2.zip present and correct in lib dir
2013-05-09 23:10:08 [FINEST] [ForgeModLoader] Found library file scala-library.jar present and correct in lib dir
2013-05-09 23:10:08 [SEVERE] [ForgeModLoader] There were errors during initial FML setup. Some files failed to download or were otherwise corrupted. You will need to manually obtain the following files from these download links and ensure your lib directory is clean.
2013-05-09 23:10:08 [SEVERE] [ForgeModLoader] *** Download http://files.minecraftforge.net/fmllibs/argo-small-3.2.jar
2013-05-09 23:10:08 [SEVERE] [ForgeModLoader] *** Download http://files.minecraftforge.net/fmllibs/guava-14.0-rc3.jar
2013-05-09 23:10:08 [SEVERE] [ForgeModLoader] *** Download http://files.minecraftforge.net/fmllibs/asm-all-4.1.jar
2013-05-09 23:10:08 [SEVERE] [ForgeModLoader] *** Download http://files.minecraftforge.net/fmllibs/bcprov-jdk15on-148.jar
2013-05-09 23:10:08 [SEVERE] [ForgeModLoader] *** Download http://files.minecraftforge.net/fmllibs/deobfuscation_data_1.5.2.zip
2013-05-09 23:10:08 [SEVERE] [ForgeModLoader] *** Download http://files.minecraftforge.net/fmllibs/scala-library.jar
2013-05-09 23:10:08 [SEVERE] [ForgeModLoader] <===========>
2013-05-09 23:10:08 [SEVERE] [ForgeModLoader] The following is the errors that caused the setup to fail. They may help you diagnose and resolve the issue
2013-05-09 23:10:08 [SEVERE] [ForgeModLoader] A download error occured
2013-05-09 23:10:08 [SEVERE] [ForgeModLoader] A download error occured
2013-05-09 23:10:08 [SEVERE] [ForgeModLoader] <<< ==== >>>
2013-05-09 23:10:08 [SEVERE] [ForgeModLoader] The following is diagnostic information for developers to review.
2013-05-09 23:10:08 [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.replace(Launcher.java:153)
at net.minecraft.Launcher$1.run(Launcher.java:94)
Caused by: java.net.SocketTimeoutException: Read timed out
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at sun.net.www.protocol.http.HttpURLConnection$6.run(Unknown Source)
at sun.net.www.protocol.http.HttpURLConnection$6.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at sun.net.www.protocol.http.HttpURLConnection.getChainedException(Unknown Source)
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source)
at cpw.mods.fml.relauncher.RelaunchLibraryManager.downloadFile(RelaunchLibraryManager.java:532)
... 7 more
Caused by: java.net.SocketTimeoutException: Read timed out
at java.net.SocketInputStream.socketRead0(Native Method)
at java.net.SocketInputStream.read(Unknown Source)
at java.net.SocketInputStream.read(Unknown Source)
at java.io.BufferedInputStream.fill(Unknown Source)
at java.io.BufferedInputStream.read1(Unknown Source)
at java.io.BufferedInputStream.read(Unknown Source)
at sun.net.www.http.HttpClient.parseHTTPHeader(Unknown Source)
at sun.net.www.http.HttpClient.parseHTTP(Unknown Source)
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source)
at sun.net.www.protocol.http.HttpURLConnection.getHeaderField(Unknown Source)
at java.net.URLConnection.getHeaderFieldLong(Unknown Source)
at java.net.URLConnection.getContentLengthLong(Unknown Source)
at java.net.URLConnection.getContentLength(Unknown Source)
at cpw.mods.fml.relauncher.RelaunchLibraryManager.downloadFile(RelaunchLibraryManager.java:531)
... 7 more
2013-05-09 23:10:08 [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.replace(Launcher.java:153)
at net.minecraft.Launcher$1.run(Launcher.java:94)
Caused by: java.net.SocketTimeoutException: Read timed out
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at sun.net.www.protocol.http.HttpURLConnection$6.run(Unknown Source)
at sun.net.www.protocol.http.HttpURLConnection$6.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at sun.net.www.protocol.http.HttpURLConnection.getChainedException(Unknown Source)
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source)
at cpw.mods.fml.relauncher.RelaunchLibraryManager.downloadFile(RelaunchLibraryManager.java:532)
... 7 more
Caused by: java.net.SocketTimeoutException: Read timed out
at java.net.SocketInputStream.socketRead0(Native Method)
at java.net.SocketInputStream.read(Unknown Source)
at java.net.SocketInputStream.read(Unknown Source)
at java.io.BufferedInputStream.fill(Unknown Source)
at java.io.BufferedInputStream.read1(Unknown Source)
at java.io.BufferedInputStream.read(Unknown Source)
at sun.net.www.http.HttpClient.parseHTTPHeader(Unknown Source)
at sun.net.www.http.HttpClient.parseHTTP(Unknown Source)
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source)
at sun.net.www.protocol.http.HttpURLConnection.getHeaderField(Unknown Source)
at java.net.URLConnection.getHeaderFieldLong(Unknown Source)
at java.net.URLConnection.getContentLengthLong(Unknown Source)
at java.net.URLConnection.getContentLength(Unknown Source)
at cpw.mods.fml.relauncher.RelaunchLibraryManager.downloadFile(RelaunchLibraryManager.java:531)
... 7 more
2013-05-09 23:10:20 [INFO] [STDERR] Exception in thread "Thread-2" java.lang.RuntimeException: java.lang.RuntimeException: A fatal error occured and FML cannot continue
2013-05-09 23:10:20 [INFO] [STDERR] at cpw.mods.fml.relauncher.FMLRelauncher.setupHome(FMLRelauncher.java:192)
2013-05-09 23:10:20 [INFO] [STDERR] at cpw.mods.fml.relauncher.FMLRelauncher.relaunchApplet(FMLRelauncher.java:259)
2013-05-09 23:10:20 [INFO] [STDERR] at cpw.mods.fml.relauncher.FMLRelauncher.appletEntry(FMLRelauncher.java:229)
2013-05-09 23:10:20 [INFO] [STDERR] at net.minecraft.client.MinecraftApplet.init(MinecraftApplet.java:25)
2013-05-09 23:10:20 [INFO] [STDERR] at net.minecraft.Launcher.replace(Launcher.java:153)
2013-05-09 23:10:20 [INFO] [STDERR] at net.minecraft.Launcher$1.run(Launcher.java:94)
2013-05-09 23:10:20 [INFO] [STDERR] Caused by: java.lang.RuntimeException: A fatal error occured and FML cannot continue
2013-05-09 23:10:20 [INFO] [STDERR] at cpw.mods.fml.relauncher.RelaunchLibraryManager.handleLaunch(RelaunchLibraryManager.java:261)
2013-05-09 23:10:20 [INFO] [STDERR] at cpw.mods.fml.relauncher.FMLRelauncher.setupHome(FMLRelauncher.java:172)
2013-05-09 23:10:20 [INFO] [STDERR] ... 5 more
.....
2013-05-09 23:10:08 [SEVERE] [ForgeModLoader] There were errors during initial FML setup. Some files failed to download or were otherwise corrupted. You will need to manually obtain the following files from these download links and ensure your lib directory is clean.
2013-05-09 23:10:08 [SEVERE] [ForgeModLoader] *** Download http://files.minecra...o-small-3.2.jar
2013-05-09 23:10:08 [SEVERE] [ForgeModLoader] *** Download http://files.minecra...va-14.0-rc3.jar
2013-05-09 23:10:08 [SEVERE] [ForgeModLoader] *** Download http://files.minecra...asm-all-4.1.jar
2013-05-09 23:10:08 [SEVERE] [ForgeModLoader] *** Download http://files.minecra...jdk15on-148.jar
2013-05-09 23:10:08 [SEVERE] [ForgeModLoader] *** Download http://files.minecra..._data_1.5.2.zip
2013-05-09 23:10:08 [SEVERE] [ForgeModLoader] *** Download http://files.minecra...ala-library.jar
2013-05-09 23:10:08 [SEVERE] [ForgeModLoader] <===========>
.....
See the links in the error? Minecraft forge needs those files to run, but can't seem to download them. You need to download them manually, then copy them into yourminecraftfolder/lib
Client Log
2013-05-09 23:09:52 [INFO] [ForgeModLoader] Forge Mod Loader version 5.2.2.684 for Minecraft 1.5.2 loading
2013-05-09 23:09:52 [INFO] [ForgeModLoader] Java is Java HotSpot(TM) Client VM, version 1.7.0_21, running on Windows Vista:x86:6.0, installed at C:\Program Files (x86)\Java\jre7
2013-05-09 23:09:52 [FINE] [ForgeModLoader] Java classpath at launch is /C:/Users/Pacetes/AppData/Local/Temp/e4jED00.tmp_dir/MinecraftSP.jar
2013-05-09 23:09:52 [FINE] [ForgeModLoader] Java library path at launch is C:\Windows\SysWOW64;C:\Windows\Sun\Java\bin;C:\Windows\system32;C:\Windows;C:\Program Files (x86)\AMD APP\bin\x86_64;C:\Program Files (x86)\AMD APP\bin\x86;C:\Program Files\Common Files\Microsoft Shared\Windows Live;C:\Program Files (x86)\Common Files\Microsoft Shared\Windows Live;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Program Files (x86)\Windows Live\Shared;C:\Program Files (x86)\ATI Technologies\ATI.ACE\Core-Static;c:\program files (x86)\java\jre7\bin;.
2013-05-09 23:09:52 [FINE] [ForgeModLoader] Enabling runtime deobfuscation
2013-05-09 23:09:52 [FINEST] [ForgeModLoader] All core mods are successfully located
2013-05-09 23:09:52 [FINEST] [ForgeModLoader] Discovering coremods
2013-05-09 23:09:52 [FINEST] [ForgeModLoader] Found library file argo-small-3.2.jar present and correct in lib dir
2013-05-09 23:09:52 [FINEST] [ForgeModLoader] Downloading file http://files.minecraftforge.net/fmllibs/guava-14.0-rc3.jar
2013-05-09 23:09:52 [INFO] [ForgeModLoader] Downloading file http://files.minecraftforge.net/fmllibs/guava-14.0-rc3.jar
2013-05-09 23:10:00 [SEVERE] [ForgeModLoader] There was a problem downloading the file guava-14.0-rc3.jar automatically. Perhaps you have an environment without internet access. You will need to download the file manually or restart and let it try again
2013-05-09 23:10:00 [FINEST] [ForgeModLoader] Downloading file http://files.minecraftforge.net/fmllibs/asm-all-4.1.jar
2013-05-09 23:10:00 [INFO] [ForgeModLoader] Downloading file http://files.minecraftforge.net/fmllibs/asm-all-4.1.jar
2013-05-09 23:10:03 [FINEST] [ForgeModLoader] Download complete
2013-05-09 23:10:03 [INFO] [ForgeModLoader] Download complete
2013-05-09 23:10:03 [FINEST] [ForgeModLoader] Library file asm-all-4.1.jar was downloaded and verified successfully
2013-05-09 23:10:03 [FINEST] [ForgeModLoader] Downloading file http://files.minecraftforge.net/fmllibs/bcprov-jdk15on-148.jar
2013-05-09 23:10:03 [INFO] [ForgeModLoader] Downloading file http://files.minecraftforge.net/fmllibs/bcprov-jdk15on-148.jar
2013-05-09 23:10:08 [SEVERE] [ForgeModLoader] There was a problem downloading the file bcprov-jdk15on-148.jar automatically. Perhaps you have an environment without internet access. You will need to download the file manually or restart and let it try again
2013-05-09 23:10:08 [FINEST] [ForgeModLoader] Found library file deobfuscation_data_1.5.2.zip present and correct in lib dir
2013-05-09 23:10:08 [FINEST] [ForgeModLoader] Found library file scala-library.jar present and correct in lib dir
2013-05-09 23:10:08 [SEVERE] [ForgeModLoader] There were errors during initial FML setup. Some files failed to download or were otherwise corrupted. You will need to manually obtain the following files from these download links and ensure your lib directory is clean.
2013-05-09 23:10:08 [SEVERE] [ForgeModLoader] *** Download http://files.minecraftforge.net/fmllibs/argo-small-3.2.jar
2013-05-09 23:10:08 [SEVERE] [ForgeModLoader] *** Download http://files.minecraftforge.net/fmllibs/guava-14.0-rc3.jar
2013-05-09 23:10:08 [SEVERE] [ForgeModLoader] *** Download http://files.minecraftforge.net/fmllibs/asm-all-4.1.jar
2013-05-09 23:10:08 [SEVERE] [ForgeModLoader] *** Download http://files.minecraftforge.net/fmllibs/bcprov-jdk15on-148.jar
2013-05-09 23:10:08 [SEVERE] [ForgeModLoader] *** Download http://files.minecraftforge.net/fmllibs/deobfuscation_data_1.5.2.zip
2013-05-09 23:10:08 [SEVERE] [ForgeModLoader] *** Download http://files.minecraftforge.net/fmllibs/scala-library.jar
2013-05-09 23:10:08 [SEVERE] [ForgeModLoader] <===========>
2013-05-09 23:10:08 [SEVERE] [ForgeModLoader] The following is the errors that caused the setup to fail. They may help you diagnose and resolve the issue
2013-05-09 23:10:08 [SEVERE] [ForgeModLoader] A download error occured
2013-05-09 23:10:08 [SEVERE] [ForgeModLoader] A download error occured
2013-05-09 23:10:08 [SEVERE] [ForgeModLoader] <<< ==== >>>
2013-05-09 23:10:08 [SEVERE] [ForgeModLoader] The following is diagnostic information for developers to review.
2013-05-09 23:10:08 [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.replace(Launcher.java:153)
at net.minecraft.Launcher$1.run(Launcher.java:94)
Caused by: java.net.SocketTimeoutException: Read timed out
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at sun.net.www.protocol.http.HttpURLConnection$6.run(Unknown Source)
at sun.net.www.protocol.http.HttpURLConnection$6.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at sun.net.www.protocol.http.HttpURLConnection.getChainedException(Unknown Source)
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source)
at cpw.mods.fml.relauncher.RelaunchLibraryManager.downloadFile(RelaunchLibraryManager.java:532)
... 7 more
Caused by: java.net.SocketTimeoutException: Read timed out
at java.net.SocketInputStream.socketRead0(Native Method)
at java.net.SocketInputStream.read(Unknown Source)
at java.net.SocketInputStream.read(Unknown Source)
at java.io.BufferedInputStream.fill(Unknown Source)
at java.io.BufferedInputStream.read1(Unknown Source)
at java.io.BufferedInputStream.read(Unknown Source)
at sun.net.www.http.HttpClient.parseHTTPHeader(Unknown Source)
at sun.net.www.http.HttpClient.parseHTTP(Unknown Source)
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source)
at sun.net.www.protocol.http.HttpURLConnection.getHeaderField(Unknown Source)
at java.net.URLConnection.getHeaderFieldLong(Unknown Source)
at java.net.URLConnection.getContentLengthLong(Unknown Source)
at java.net.URLConnection.getContentLength(Unknown Source)
at cpw.mods.fml.relauncher.RelaunchLibraryManager.downloadFile(RelaunchLibraryManager.java:531)
... 7 more
2013-05-09 23:10:08 [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.replace(Launcher.java:153)
at net.minecraft.Launcher$1.run(Launcher.java:94)
Caused by: java.net.SocketTimeoutException: Read timed out
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at sun.net.www.protocol.http.HttpURLConnection$6.run(Unknown Source)
at sun.net.www.protocol.http.HttpURLConnection$6.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at sun.net.www.protocol.http.HttpURLConnection.getChainedException(Unknown Source)
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source)
at cpw.mods.fml.relauncher.RelaunchLibraryManager.downloadFile(RelaunchLibraryManager.java:532)
... 7 more
Caused by: java.net.SocketTimeoutException: Read timed out
at java.net.SocketInputStream.socketRead0(Native Method)
at java.net.SocketInputStream.read(Unknown Source)
at java.net.SocketInputStream.read(Unknown Source)
at java.io.BufferedInputStream.fill(Unknown Source)
at java.io.BufferedInputStream.read1(Unknown Source)
at java.io.BufferedInputStream.read(Unknown Source)
at sun.net.www.http.HttpClient.parseHTTPHeader(Unknown Source)
at sun.net.www.http.HttpClient.parseHTTP(Unknown Source)
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source)
at sun.net.www.protocol.http.HttpURLConnection.getHeaderField(Unknown Source)
at java.net.URLConnection.getHeaderFieldLong(Unknown Source)
at java.net.URLConnection.getContentLengthLong(Unknown Source)
at java.net.URLConnection.getContentLength(Unknown Source)
at cpw.mods.fml.relauncher.RelaunchLibraryManager.downloadFile(RelaunchLibraryManager.java:531)
... 7 more
2013-05-09 23:10:20 [INFO] [STDERR] Exception in thread "Thread-2" java.lang.RuntimeException: java.lang.RuntimeException: A fatal error occured and FML cannot continue
2013-05-09 23:10:20 [INFO] [STDERR] at cpw.mods.fml.relauncher.FMLRelauncher.setupHome(FMLRelauncher.java:192)
2013-05-09 23:10:20 [INFO] [STDERR] at cpw.mods.fml.relauncher.FMLRelauncher.relaunchApplet(FMLRelauncher.java:259)
2013-05-09 23:10:20 [INFO] [STDERR] at cpw.mods.fml.relauncher.FMLRelauncher.appletEntry(FMLRelauncher.java:229)
2013-05-09 23:10:20 [INFO] [STDERR] at net.minecraft.client.MinecraftApplet.init(MinecraftApplet.java:25)
2013-05-09 23:10:20 [INFO] [STDERR] at net.minecraft.Launcher.replace(Launcher.java:153)
2013-05-09 23:10:20 [INFO] [STDERR] at net.minecraft.Launcher$1.run(Launcher.java:94)
2013-05-09 23:10:20 [INFO] [STDERR] Caused by: java.lang.RuntimeException: A fatal error occured and FML cannot continue
2013-05-09 23:10:20 [INFO] [STDERR] at cpw.mods.fml.relauncher.RelaunchLibraryManager.handleLaunch(RelaunchLibraryManager.java:261)
2013-05-09 23:10:20 [INFO] [STDERR] at cpw.mods.fml.relauncher.FMLRelauncher.setupHome(FMLRelauncher.java:172)
2013-05-09 23:10:20 [INFO] [STDERR] ... 5 more
See the links in the error? Minecraft forge needs those files to run, but can't seem to download them. You need to download them manually, then copy them into yourminecraftfolder/lib