Unable to build the source

I downloaded Jigsaw2.2.4 on windows2000 Professional and tried to build 
the source by running the build script build.xml using ANT. I am getting 
the following error:

===============================================================================================
 Buildfile: build.xml

BUILD FAILED
java.lang.AbstractMethodError: 
javax.xml.parsers.SAXParser.getXMLReader()Lorg/xm
l/sax/XMLReader;
        at 
org.apache.tools.ant.util.JAXPUtils.getNamespaceXMLReader(JAXPUtils.j
ava:163)
        at 
org.apache.tools.ant.helper.ProjectHelper2.parse(ProjectHelper2.java:
184)
        at 
org.apache.tools.ant.helper.ProjectHelper2.parse(ProjectHelper2.java:
131)
        at 
org.apache.tools.ant.ProjectHelper.configureProject(ProjectHelper.jav
a:91)
        at org.apache.tools.ant.Main.runBuild(Main.java:658)
        at org.apache.tools.ant.Main.startAnt(Main.java:188)
        at org.apache.tools.ant.launch.Launcher.run(Launcher.java:196)
        at org.apache.tools.ant.launch.Launcher.main(Launcher.java:55)

Total time: 0 seconds
java.lang.AbstractMethodError: 
javax.xml.parsers.SAXParser.getXMLReader()Lorg/xm
l/sax/XMLReader;
        at 
org.apache.tools.ant.util.JAXPUtils.getNamespaceXMLReader(JAXPUtils.j
ava:163)
        at 
org.apache.tools.ant.helper.ProjectHelper2.parse(ProjectHelper2.java:
184)
        at 
org.apache.tools.ant.helper.ProjectHelper2.parse(ProjectHelper2.java:
131)
        at 
org.apache.tools.ant.ProjectHelper.configureProject(ProjectHelper.jav
a:91)
        at org.apache.tools.ant.Main.runBuild(Main.java:658)
        at org.apache.tools.ant.Main.startAnt(Main.java:188)
        at org.apache.tools.ant.launch.Launcher.run(Launcher.java:196)
        at org.apache.tools.ant.launch.Launcher.main(Launcher.java:55)
javax.xml.parsers.SAXParser.getXMLReader()Lorg/xml/sax/XMLReader;
===============================================================================================

Any Ideas/Input will be greatly appreciated!

Thanks,
Senthil.


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