[news.eclipse.platform.rcp] Error 'invalid Manifest: null' when exportin

[shengzong_zhou@xxxxxxxxx (Shengzong Zhou)]

I am having trouble exporting my RCP product. When I use the Product 
Export Wizard I get an error like this:

C:\Eclipse_Workspace\.metadata\.plugins\org.eclipse.pde.core\temp\org.eclipse.pde.container.feature\assemble.org.eclipse.pde.container.feature.win32.win32.x86.xml:67: 
The following error occurred while executing this line: 
C:\EclipseWorkspaces\.metadata\.plugins\org.eclipse.pde.core\temp\org.eclipse.pde.container.feature\assemble.org.eclipse.pde.container.feature.win32.win32.x86.xml:24: 
invalid Manifest: null

The content of the file 
C:\Eclipse_Workspace\.metadata\.plugins\org.eclipse.pde.core\temp\org.eclipse.pde.container.feature\assemble.org.eclipse.pde.container.feature.win32.win32.x86.xml 
is:

<?xml version="1.0" encoding="UTF-8"?>
<project name="Assemble org.eclipse.pde.container.feature" default="main">
	<property name="archiveName" 
value="org.eclipse.pde.container.feature-${buildId}-win32.win32.x86.zip"/>
	<property name="os" value="win32"/>
	<property name="ws" value="win32"/>
	<property name="arch" value="x86"/>
	<property name="jarProcessor.sign" value="false"/>
	<property name="assemblyTempDir" value="${buildDirectory}/tmp"/>
	<property name="eclipse.base" 
value="${assemblyTempDir}/${collectingFolder}"/>
	<property name="eclipse.plugins" value="${eclipse.base}/plugins"/>
	<property name="eclipse.features" value="${eclipse.base}/features"/>
	<property name="archiveFullPath" 
value="${basedir}/${buildLabel}/${archiveName}"/>
	<property name="launcherName" value="AssetManagement"/>
	<property name="tarargs" value=""/>
	<!-- Beginning of the jarUp task -->
	<target name="jarUp" description="Create a jar from the given location.">
		<available property="${source}/${elementName}_exists" 
file="${source}/${elementName}"/>
		<antcall target="jarIng">
			<param name="source" value="${source}"/>
			<param name="elementName" value="${elementName}"/>
		</antcall>
	</target>
	<target name="jarIng" if="${source}/${elementName}_exists">
		<jar destfile="${source}/${elementName}.jar" 
basedir="${source}/${elementName}" filesetmanifest="merge"/>
		<delete dir="${source}/${elementName}"/>
	</target>
	<!-- End of the jarUp task -->
	<!-- Beginning of the jar signing  target -->
	<target name="jarSigning" description="Sign a jar.">
		<eclipse.jarProcessor sign="${jarProcessor.sign}" 
pack="${jarProcessor.pack200}" unsign="${jarProcessor.unsign}" 
jar="${source}/${elementName}.jar" alias="${sign.alias}" 
keystore="${sign.keystore}" storepass="${sign.storepass}"/>
	</target>
	<!-- End of the jarUp task -->
	<target name="main">
		<condition property="pluginArchivePrefix" value="plugins">
			<equals arg1="${archivePrefix}"  arg2="" trim="true"/>
		</condition>
		<property name="pluginArchivePrefix" value="${archivePrefix}/plugins"/>

		<condition property="featureArchivePrefix" value="features">
			<equals arg1="${archivePrefix}"  arg2="" trim="true"/>
		</condition>
		<property name="featureArchivePrefix" value="${archivePrefix}/features"/>

		<dirname property="archiveParentFolder" file="${archiveFullPath}"/>
		<mkdir dir="${archiveParentFolder}"/>
		<mkdir dir="${assemblyTempDir}"/>
		<mkdir dir="${buildLabel}"/>
		<ant antfile="build.xml" 
dir="..\..\..\..\..\com.sungard.assetarena.hibernate" 
target="gather.bin.parts">
			<property name="destination.temp.folder" value="${eclipse.plugins}"/>
		</ant>
		<ant antfile="build.xml" 
dir="..\..\..\..\..\com.sungard.assetarena.hibernatehelper" 
target="gather.bin.parts">
			<property name="destination.temp.folder" value="${eclipse.plugins}"/>
		</ant>
		<ant antfile="build.xml" 
dir="..\..\..\..\..\com.sungard.assetarena.oracle" 
target="gather.bin.parts">
			<property name="destination.temp.folder" value="${eclipse.plugins}"/>
		</ant>
		<ant antfile="build.xml" dir="..\..\..\..\..\AssetManagement" 
target="gather.bin.parts">
			<property name="destination.temp.folder" value="${eclipse.plugins}"/>
		</ant>
		<ant antfile="build.xml" dir="" target="gather.bin.parts">
			<property name="feature.base" value="${eclipse.base}"/>
		</ant>
		<antcall target="jarUp">
			<param name="source" value="${eclipse.plugins}"/>
			<param name="elementName" 
value="com.sungard.assetarena.hibernatehelper_1.0.0"/>
		</antcall>
		<antcall target="jarUp">
			<param name="source" value="${eclipse.plugins}"/>
			<param name="elementName" value="AssetManagement_1.0.0"/>
		</antcall>
		<eclipse.brand 
root="${eclipse.base}/win32.win32.x86/${collectingFolder}" 
icons="${launcherIcons}" name="${launcherName}" os="${os}"		/>
		<chmod perm="755" 
dir="${eclipse.base}/win32.win32.x86/${collectingFolder}" 
includes="AssetManagement" /> 
		<move todir="${eclipse.base}" failonerror="false">
			<fileset dir="${eclipse.base}/win32.win32.x86/${collectingFolder}">
				<include name="**/**"/>
			</fileset>
		</move>
		<delete dir="${eclipse.base}/win32.win32.x86"/>
	</target>
</project>

Any help or advice would be appreciated.

Thanks,

Shengzong