checkstyle-4.4 ANT Task help please.

I was getting the dreaded

    <error line="0"severity="error"message="Got an 
exception - java.lang.ClassCastException: antlr.CommonAST"source="com.puppycrawl.tools.checkstyle.TreeWalker"/>

My build file is rather simple:
<project name="MyCheckStyle" default="checkstyle">
    
    <taskdef resource="checkstyletask.properties" classpath="E:\checkstyle-4.4\checkstyle-all-4.4.jar"/>
    
    <target name="checkstyle" description="Generates a report of code convention violations.">
    
        <echoproperties/>
    
        <checkstyle config="sun_checks.xml">
            <fileset dir="e:/src" includes="**/*.java"/>
            <formatter type="xml" toFile="mycheckstyle_errors.xml"/>
        </checkstyle>
    </target>

</project>

I got rid of it by getting rid of the ANTLR*.jar files in the Ant /lib directory. That's fine for now, but when this thing becomes part of our nightly build, we will need those ANTLR*.jar files back in. 

So what's the proper way of doing this?



 Any pointers appreciated. Thanks in advance.

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