java.lang.RuntimeException: A download error occured

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java.lang.RuntimeException: A download error occured
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1625)
at sun.net.www.protocol.http.HttpURLConnection.getHeaderField(HttpURLConnection.java:2691)
at java.net.URLConnection.getHeaderFieldLong(URLConnection.java:639)
at java.net.URLConnection.getContentLengthLong(URLConnection.java:511)
at java.net.URLConnection.getContentLength(URLConnection.java:495)
at cpw.mods.fml.relauncher.RelaunchLibraryManager.downloadFile(RelaunchLibraryManager.java:531)
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.relaunchServer(FMLRelauncher.java:147)
at net.minecraft.server.MinecraftServer.main(MinecraftServer.java:1367)

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