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java.io.IOException: Server returned HTTP response code: 401 for URL: http://network_website/menu.jar	at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source)	at sun.plugin.net.protocol.http.HttpURLConnection.getInputStream(Unknown Source)	at sun.net.www.protocol.http.HttpURLConnection.getHeaderFields(Unknown Source)	at sun.plugin.net.protocol.http.HttpURLConnection.checkCookieHeader(Unknown Source)	at sun.plugin.net.protocol.http.HttpURLConnection.getInputStream(Unknown Source)	at sun.plugin.net.protocol.http.HttpUtils.followRedirects(Unknown Source)	at sun.plugin.cache.CachedJarLoader.download(Unknown Source)	at sun.plugin.cache.CachedJarLoader.load(Unknown Source)	at sun.plugin.cache.JarCache.get(Unknown Source)	at sun.plugin.net.protocol.jar.CachedJarURLConnection.connect(Unknown Source)	at sun.plugin.net.protocol.jar.CachedJarURLConnection.getJarFile(Unknown Source)	at sun.misc.URLClassPath$JarLoader.getJarFile(Unknown Source)	at sun.misc.URLClassPath$JarLoader.(Unknown Source)	at sun.misc.URLClassPath$2.run(Unknown Source)	at java.security.AccessController.doPrivileged(Native Method)	at sun.misc.URLClassPath.getLoader(Unknown Source)	at sun.misc.URLClassPath.getLoader(Unknown Source)	at sun.misc.URLClassPath.getResource(Unknown Source)	at java.net.URLClassLoader$1.run(Unknown Source)	at java.security.AccessController.doPrivileged(Native Method)	at java.net.URLClassLoader.findClass(Unknown Source)	at sun.applet.AppletClassLoader.findClass(Unknown Source)	at sun.plugin.security.PluginClassLoader.findClass(Unknown Source)	at java.lang.ClassLoader.loadClass(Unknown Source)	at sun.applet.AppletClassLoader.loadClass(Unknown Source)	at java.lang.ClassLoader.loadClass(Unknown Source)	at sun.applet.AppletClassLoader.loadCode(Unknown Source)	at sun.applet.AppletPanel.createApplet(Unknown Source)	at sun.plugin.AppletViewer.createApplet(Unknown Source)	at sun.applet.AppletPanel.runLoader(Unknown Source)	at sun.applet.AppletPanel.run(Unknown Source)	at java.lang.Thread.run(Unknown Source)