Unable to find images when running selenium/sikuli scripts using Ant - ant

Question

I've written a couple selenium scripts (Java) and use sikuli to verify the images exist. It worked fine when I ran the tests through Eclipse/TestNG but with Ant I'm getting the following error:
[testng] [error] resources/x.png looks like a file, but can't be found on the disk. Assume it's text.
The following is my build.xml, please let me know if there's more information I can provide.
<project name="test" default="test">
<property name="src.dir" location="src" />
<property name="build.dir" location="build" />
<property name="dist.dir" location="dist" />
<property name="lib.dir" location="lib" />
<path id="build.classpath">
<fileset dir="${lib.dir}">
<include name="**/*.jar" />
</fileset>
</path>
<target name="clean">
<delete dir="${build.dir}" />
</target>
<target name="makedir" depends="clean">
<mkdir dir="${build.dir}" />
</target>
<!-- Compiles the java code -->
<target name="compile" depends="clean, makedir">
<javac srcdir="${src.dir}" destdir="${build.dir}" classpathref="build.classpath"/>
</target>
<!--Creates the deployable jar file -->
<target name="jar" depends="compile">
<jar destfile="${dist.dir}\build.test.ant.jar" basedir="${build.dir}">
<manifest>
<attribute name="Main-Class" value="test.Main" />
</manifest>
</jar>
</target>
<taskdef resource="testngtasks" classpath="${lib.dir}/testng-6.5.2.jar"/>
<target name="test" depends="jar">
<testng
classpath="${build.dir}:${lib.dir}/selenium-java-2.24.1.jar:${lib.dir}/selenium-server-standalone-2.24.1.jar:${lib.dir}/sikuli-script.jar"
outputDir="${testng.report.dir}"
testname="test1">
<xmlfileset dir="." includes="testng.xml" />
</testng>
<fail message="BUILD FAILURE" if="failed" />
</target>
</project>