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what does this error mean??

 
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I have amde a stand alone application wi=hich I was trying to distribute using webstart and JNLP technology. I have made this application in Java 1.3 . If I tried launching this application on a client machine which has java 1.3 it install and runs easily...but if I am trying to install it on a machine which has java 1.4 it is giving me following error. What does this error mean? can somebody help me to understand this?
regards,
Arun Mahajan
Error:
**************

An error occurred while launching/running the application.
Title: Phoneyinsta Demo Application
Vendor: Phoneytunes.com
Category: Download Error
Unable to load resource: http://dlres.java.sun.com/servlet/com.sun.jsc.javasoft.jaws.JNLPServlet/j2se/j2re-inst-win__V1.3.0_02.jar

**********************************************
JNLPException[category: Download Error : Exception: java.io.IOException: Server returned HTTP response code: 500 for URL: http://dlres.java.sun.com/servlet/com.sun.jsc.javasoft.jaws.JNLPServlet/j2se/j2re-inst-win__V1.3.0_02.jar : LaunchDesc: null ]
at com.sun.javaws.cache.DownloadProtocol$RetrieveAction.actionDownload(Unknown Source)
at com.sun.javaws.cache.DownloadProtocol.doDownload(Unknown Source)
at com.sun.javaws.cache.DownloadProtocol.getResource(Unknown Source)
at com.sun.javaws.LaunchDownload.downloadJarFiles(Unknown Source)
at com.sun.javaws.LaunchDownload.downloadEagerorAll(Unknown Source)
at com.sun.javaws.Launcher.downloadResources(Unknown Source)
at com.sun.javaws.Launcher.handleApplicationDesc(Unknown Source)
at com.sun.javaws.Launcher.handleLaunchFile(Unknown Source)
at com.sun.javaws.Launcher.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
************************************************************
java.io.IOException: Server returned HTTP response code: 500 for URL: http://dlres.java.sun.com/servlet/com.sun.jsc.javasoft.jaws.JNLPServlet/j2se/j2re-inst-win__V1.3.0_02.jar
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source)
at sun.net.www.protocol.http.HttpURLConnection.getHeaderField(Unknown Source)
at sun.net.www.protocol.http.HttpURLConnection.getResponseCode(Unknown Source)
at com.sun.javaws.util.URLUtil.doesURLExist(Unknown Source)
at com.sun.javaws.cache.DownloadProtocol.doDownload(Unknown Source)
at com.sun.javaws.cache.DownloadProtocol.getResource(Unknown Source)
at com.sun.javaws.LaunchDownload.downloadJarFiles(Unknown Source)
at com.sun.javaws.LaunchDownload.downloadEagerorAll(Unknown Source)
at com.sun.javaws.Launcher.downloadResources(Unknown Source)
at com.sun.javaws.Launcher.handleApplicationDesc(Unknown Source)
at com.sun.javaws.Launcher.handleLaunchFile(Unknown Source)
at com.sun.javaws.Launcher.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
****************************************
 
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