tomcat6x cargo:undeploy with maven2 not supported error

Hi,

I've been using the cargo maven 2 plugin.  I was trying to get my web application undeployed from the tomcat6x container.  But, whenever I attempt to run it, it comes up with a "not supported" error.
cargo:deploy works correctly.  My only issue seems to be with cargo:undeploy.

Here's the error I get:

[INFO] [cargo:undeploy {execution: clean-undeploy}]
[INFO] ------------------------------------------------------------------------
[ERROR] FATAL ERROR
[INFO] ------------------------------------------------------------------------
[INFO] Not supported
[INFO] ------------------------------------------------------------------------
[INFO] Trace
org.codehaus.cargo.container.ContainerException: Not supported
        at org.codehaus.cargo.container.spi.deployer.AbstractDeployer.undeploy(AbstractDeployer.java:113)
        at org.codehaus.cargo.maven2.DeployerUndeployMojo.performDeployerActionOnSingleDeployable(DeployerUndeployMojo.java:39)
        at org.codehaus.cargo.maven2.AbstractDeployerMojo.performDeployerActionOnAllDeployables(AbstractDeployerMojo.java:104)
        at org.codehaus.cargo.maven2.AbstractDeployerMojo.doExecute(AbstractDeployerMojo.java:47)
        at org.codehaus.cargo.maven2.AbstractCargoMojo.execute(AbstractCargoMojo.java:255)
        at org.apache.maven.plugin.DefaultPluginManager.executeMojo(DefaultPluginManager.java:483)
        at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoals(DefaultLifecycleExecutor.java:678)
        at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalWithLifecycle(DefaultLifecycleExecutor.java:540)
        at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoal(DefaultLifecycleExecutor.java:519)
        at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalAndHandleFailures(DefaultLifecycleExecutor.java:371)
        at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeTaskSegments(DefaultLifecycleExecutor.java:332)
        at org.apache.maven.lifecycle.DefaultLifecycleExecutor.execute(DefaultLifecycleExecutor.java:181)
        at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:356)
        at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:137)
        at org.apache.maven.cli.MavenCli.main(MavenCli.java:356)
        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)

Has anyone seen this error before?

Thanks for the help,

Matt