gistfile1.xml

<?xml version="1.0" encoding="UTF-8" standalone="no"?>

<project basedir="." default="build" name="Distribution">
	<property name="debuglevel" value="source,lines,vars"/>
	<property name="target" value="1.6"/>
	<property name="source" value="1.6"/>

	<path id="Distribution.classpath">
		<pathelement location="${basedir}/bin"/>
		<fileset dir="${basedir}/lib/java">
			<include name="**/*.jar" />
		</fileset>
	</path>

	<target name="init">
		<mkdir dir="bin"/>
		<copy includeemptydirs="false" todir="bin">
			<fileset dir="src">
				<exclude name="**/*.launch"/>
				<exclude name="**/*.java"/>
			</fileset>
		</copy>
	</target>

	<target name="clean">
		<delete dir="bin"/>
	</target>

	<target depends="clean" name="cleanall"/>
	<target depends="build-subprojects,build-project" name="build"/>
	<target name="build-subprojects"/>

	<target depends="init" name="build-project">
		<echo message="${ant.project.name}: ${ant.file}"/>
		<javac debug="true" destdir="bin" source="${source}" target="${target}">
			<src path="src"/>
			<classpath refid="Distribution.classpath"/>
		</javac>
	</target>

	<target depends="build" name="run-scenarios">
    	    <taskdef name="scenarioRunner" 
    		classname="org.jbehave.ant.ScenarioRunnerTask" 
    		classpathref="Distribution.classpath" />
    
    	    <scenarioRunner 
    		scenarioIncludes="**/*Scenario.java" 
    		scenarioExcludes="**/*Steps.java" 
    		classLoaderInjected="true" 
    		skip="false" 
    		ignoreFailure="true" 
    		batch="true" 
    		scope="compile" 
    		sourceDirectory="src" 
    		testSourceDirectory="src" />
	</target>
</project>

Changed classLoaderInjected from false to true.