java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at org.apache.geronimo.st.v21.core.GeronimoV21Utils.getWebDeploymentPlan(GeronimoV21Utils.java:236)
at org.apache.geronimo.st.v21.core.GeronimoV21Utils.getWebDeploymentPlan(GeronimoV21Utils.java:199)
at org.apache.geronimo.st.v21.core.GeronimoV21Utils.getWebDeploymentPlan(GeronimoV21Utils.java:179)
at org.apache.geronimo.st.v21.core.GeronimoV21Utils.getConfigId(GeronimoV21Utils.java:119)
at org.apache.geronimo.st.core.commands.UndeployCommand.execute(UndeployCommand.java:53)
at org.apache.geronimo.st.core.commands.SynchronizedDeploymentOp.run(SynchronizedDeploymentOp.java:84)
at org.apache.geronimo.st.core.commands.SynchronizedDeploymentOp.execute(SynchronizedDeploymentOp.java:76)
at org.apache.geronimo.st.core.GeronimoServerBehaviourDelegate.unDeploy(GeronimoServerBehaviourDelegate.java:740)
at org.apache.geronimo.st.core.GeronimoServerBehaviourDelegate.doRemoved(GeronimoServerBehaviourDelegate.java:666)
at org.apache.geronimo.st.core.GeronimoServerBehaviourDelegate.invokeCommand(GeronimoServerBehaviourDelegate.java:451)
at org.eclipse.wst.server.core.model.ServerBehaviourDelegate.publish(ServerBehaviourDelegate.java:872)
at org.eclipse.wst.server.core.model.ServerBehaviourDelegate.publish(ServerBehaviourDelegate.java:708)
at org.eclipse.wst.server.core.internal.Server.publishImpl(Server.java:2690)

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