NPE when filtering fileSet

<assembly>
	<id>bin</id>

	<formats>
		<format>zip</format>
	</formats>

	<includeBaseDirectory>false</includeBaseDirectory>

	<dependencySets>
		<dependencySet>
			<outputDirectory>lib</outputDirectory>
		</dependencySet>
	</dependencySets>

	<fileSets>
		<fileSet>
			<directory>target</directory>
			<outputDirectory></outputDirectory>
			<includes>
				<include>*.jar</include>
			</includes>
		</fileSet>
		<fileSet>
			<filtered>true</filtered>
			<includes>
				<include>INSTALL*</include>
				<include>README*</include>
				<include>LICENSE*</include>
				<include>NOTICE*</include>
			</includes>
		</fileSet>
	</fileSets>

</assembly>

$ mvn -e assembly:assembly
+ Error stacktraces are turned on.
[INFO] Scanning for projects...
[INFO] Searching repository for plugin with prefix: 'assembly'.
[INFO] ------------------------------------------------------------------------
[INFO] Building Unnamed - verhas.com:isoapui8583:jar:1.0.0
[INFO]    task-segment: [assembly:assembly] (aggregator-style)
[INFO] ------------------------------------------------------------------------
[INFO] Preparing assembly:assembly
[INFO] ------------------------------------------------------------------------
[INFO] Building Unnamed - verhas.com:isoapui8583:jar:1.0.0
[INFO] ------------------------------------------------------------------------
[INFO] [resources:resources]
[INFO] Using default encoding to copy filtered resources.
Downloading: http://repo1.maven.org/maven2/xmlbeans/xbean/2.3.0-trunk-patched/xbean-2.3.0-trunk-patched.pom
Downloading: http://repo1.maven.org/maven2/groovy/groovy-all/1.5.2/groovy-all-1.5.2.pom
Downloading: http://repo1.maven.org/maven2/xerces/xercesImpl/2.9.1/xercesImpl-2.9.1.pom
Downloading: http://repo1.maven.org/maven2/cweb-extser/cweb-extser/0.1-b2-dev/cweb-extser-0.1-b2-dev.pom
Downloading: http://repo1.maven.org/maven2/jPOS/jpos/1.6.2-r2626/jpos-1.6.2-r2626.pom
[INFO] [compiler:compile]
[INFO] Nothing to compile - all classes are up to date
[INFO] [resources:testResources]
[INFO] Using default encoding to copy filtered resources.
[INFO] [compiler:testCompile]
[INFO] Nothing to compile - all classes are up to date
[INFO] [surefire:test]
[INFO] Surefire report directory: p:\projects\BASE24-soapui\BICISO-SOAPUI\target\surefire-reports

-------------------------------------------------------
 T E S T S
-------------------------------------------------------
Running com.verhas.soapui.jpos.TestServer
Tests run: 0, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.078 sec
Running com.verhas.soapui.jpos.TestClient
Tests run: 0, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.047 sec
Running com.verhas.soapui.jpos.TestClientServer
Tests run: 0, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.031 sec
Running com.verhas.soapui.jpos.TestConstants
Tests run: 0, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.031 sec

Results :

Tests run: 0, Failures: 0, Errors: 0, Skipped: 0

[INFO] [jar:jar]
[INFO] Building jar: p:\projects\BASE24-soapui\BICISO-SOAPUI\target\isoapui8583-1.0.0.jar
[INFO] [assembly:assembly]
[INFO] Reading assembly descriptor: src/assembly/doc.xml
[INFO] Reading assembly descriptor: src/assembly/bin.xml
[INFO] Reading assembly descriptor: src/assembly/src.xml
[INFO] Building zip: p:\projects\BASE24-soapui\BICISO-SOAPUI\target\isoapui8583-1.0.0-doc.zip
[INFO] ------------------------------------------------------------------------
[ERROR] FATAL ERROR
[INFO] ------------------------------------------------------------------------
[INFO] null
[INFO] ------------------------------------------------------------------------
[INFO] Trace
java.lang.NullPointerException
        at java.io.File.<init>(File.java:222)
        at org.apache.maven.shared.model.fileset.util.FileSetManager.scan(FileSetManager.java:598)
        at org.apache.maven.shared.model.fileset.util.FileSetManager.getIncludedFiles(FileSetManager.java:186)
        at org.apache.maven.plugin.assembly.format.FileSetFormatter.formatFileSetForAssembly(FileSetFormatter.java:67)
        at org.apache.maven.plugin.assembly.archive.task.AddFileSetsTask.addFileSet(AddFileSetsTask.java:133)
        at org.apache.maven.plugin.assembly.archive.task.AddFileSetsTask.execute(AddFileSetsTask.java:87)
        at org.apache.maven.plugin.assembly.archive.phase.FileSetAssemblyPhase.execute(FileSetAssemblyPhase.java:54)
        at org.apache.maven.plugin.assembly.archive.DefaultAssemblyArchiver.createArchive(DefaultAssemblyArchiver.java:129)
        at org.apache.maven.plugin.assembly.mojos.AbstractAssemblyMojo.execute(AbstractAssemblyMojo.java:322)
        at org.apache.maven.plugin.DefaultPluginManager.executeMojo(DefaultPluginManager.java:451)
        at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoals(DefaultLifecycleExecutor.java:558)
        at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeStandaloneGoal(DefaultLifecycleExecutor.java:512)
        at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoal(DefaultLifecycleExecutor.java:482)
        at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalAndHandleFailures(DefaultLifecycleExecutor.java:330)
        at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeTaskSegments(DefaultLifecycleExecutor.java:227)
        at org.apache.maven.lifecycle.DefaultLifecycleExecutor.execute(DefaultLifecycleExecutor.java:142)
        at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:336)
        at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:129)
        at org.apache.maven.cli.MavenCli.main(MavenCli.java:287)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at org.codehaus.classworlds.Launcher.launchEnhanced(Launcher.java:315)
        at org.codehaus.classworlds.Launcher.launch(Launcher.java:255)
        at org.codehaus.classworlds.Launcher.mainWithExitCode(Launcher.java:430)
        at org.codehaus.classworlds.Launcher.main(Launcher.java:375)
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 53 seconds
[INFO] Finished at: Fri Jul 18 13:04:38 CEST 2008
[INFO] Final Memory: 11M/22M
[INFO] ------------------------------------------------------------------------