Getting the file not found exception while running the lisa 8 test from ANT. Even though the file is existing in the specified directory, It is saying some thing like could not stage.

my build.xml is :
<?xml version="1.0"?>
<project name="${vs.project.name}" default="lisaTests" basedir=".">
<loadproperties>
<file file="build.properties"/>
</loadproperties>
<echo message="${LISA_HOME}"/>
<echo message="the base directory is ${vs.project.base.dir}"/>
<taskdef resource="AntTasks.properties">
<classpath>
<fileset dir="${LISA_HOME}\lib\shared" includes="**/*.jar"></fileset>
<fileset dir="${LISA_HOME}\lib\core" includes="**/*.jar">
</fileset>
</classpath>
</taskdef>
<target name="lisaTests" description="Executes a LISA Test Suite as JUnit tests.">
<echo message="Executes a LISA Test Suite as JUnit tests.( make sure old reports are deleted)"/>
<delete dir="${vs.project.build.report.dir}"/>
<mkdir dir="${vs.project.build.report.dir}"/>
<echo message="Run the lisa test in junit mode in base dir:${basedir}"/>
<junitlisa test="Tests\ReadXMLFile.tst" toDir="${vs.project.build.report.dir}" registry="${vs.sandbox.registry.url}" haltOnError="no" errorProperty="test.failure" user="admin" password="admin">
<jvmarg value="-Dlisa.tmpdir=${vs.project.build.temp.dir}"/></junitlisa>
<echo message="Generate junit style html report."/>
<junitlisareport toDir="${vs.project.build.report.dir}"/>
<echo message="The JUnit report is available at ${vs.project.build.report.dir}/index.html"/>
</target>
</project>
build.properties:
# This is the properties file defining build properties for ant tasks
LISA_HOME=C:/Program Files/CA/DevTest
vs.sandbox.registry.url=tcp://usilasd00301:2010/devRegistry
vs.sandbox.vse.name=sandbox
vs.project.name=DevOps
#vs.project.version=v1.0
#vs.project.path=workspace/sandbox_soap
#vs.project.test.suite.dir=${vs.project.build.dir}/${vs.project.path}/Suites/AllTestsSuite.ste
vs.project.base.dir=${basedir}
vs.project.build.dir=${basedir}/build/
vs.project.build.report.dir=${vs.project.build.dir}/report/
vs.project.build.temp.dir=${basedir}/build/tmp
Does any one has the same issue ?