Running the following build file produces an error:

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<project xmlns:fx="javafx:com.sun.javafx.tools.ant" default="fx-deploy">
    <taskdef classpath="C:\Program Files\Java\jdk1.8.0\lib\ant-javafx.jar" resource="com/sun/javafx/tools/ant/antlib.xml" uri="javafx:com.sun.javafx.tools.ant"/>
    <target name="fx-deploy">
        <fx:deploy nativeBundles="image" outdir="C:\Users\DM_ZIN~1\AppData\Local\Temp\testBundlerWorkDir" outfile="test" verbose="true">
            <fx:resources>
                <fx:fileset dir="C:\Users\DM_ZIN~1\AppData\Local\Temp\testBundlerWorkDir\jars" includes="Util.jar,testFxAppWithUtil.jar"/>
            </fx:resources>
            <fx:platform/>
            <fx:preferences/>
            <fx:application/>
            <fx:info/>
            <fx:bundleArgument arg="classpath" value="testFxAppWithUtil.jar;Util.jar"/>
            <fx:bundleArgument arg="mainJar" value="C:\Users\DM_ZIN~1\AppData\Local\Temp\testBundlerWorkDir\jars\testFxAppWithUtil.jar"/>
        </fx:deploy>
    </target>
</project>

Bundler Windows Application Image skipped because of a configuration problem: An application class was not specified nor was one found in the jar RelativeFileSet{basedir:C:\Users\DM_ZIN~1\AppData\Local\Temp\testBundlerWorkDir, files:[C:\Users\DM_ZIN~1\AppData\Local\Temp\testBundlerWorkDir\jars\testFxAppWithUtil.jar]}
Advice to fix: Please specify a applicationClass or ensure that the jar RelativeFileSet{basedir:C:\Users\DM_ZIN~1\AppData\Local\Temp\testBundlerWorkDir, files:[C:\Users\DM_ZIN~1\AppData\Local\Temp\testBundlerWorkDir\jars\testFxAppWithUtil.jar]} specifies one in the manifest.

This message is seen when nativeBundles="msi" is specified but the bundle is nevertheless created.