java.lang.NullPointerException: null

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java.lang.NullPointerException: null
at org.commonjava.maven.ext.manip.impl.DependencyRemovalManipulator.apply(DependencyRemovalManipulator.java:109)
at org.commonjava.maven.ext.manip.impl.DependencyRemovalManipulator.applyChanges(DependencyRemovalManipulator.java:91)
at org.commonjava.maven.ext.manip.ManipulationManager.applyManipulations(ManipulationManager.java:227)
at org.commonjava.maven.ext.manip.ManipulationManager.scanAndApply(ManipulationManager.java:148)
at org.commonjava.maven.ext.manip.ManipulatingEventSpy.onEvent(ManipulatingEventSpy.java:132)
at org.apache.maven.eventspy.internal.EventSpyDispatcher.onEvent(EventSpyDispatcher.java:108)
at org.apache.maven.eventspy.internal.EventSpyExecutionListener.projectDiscoveryStarted(EventSpyExecutionListener.java:47)
at org.apache.maven.lifecycle.internal.DefaultExecutionEventCatapult.fire(DefaultExecutionEventCatapult.java:57)
at org.apache.maven.lifecycle.internal.DefaultExecutionEventCatapult.fire(DefaultExecutionEventCatapult.java:42)
at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:238)
at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:154)
at org.apache.maven.cli.MavenCli.execute(MavenCli.java:582)
at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:214)
at org.apache.maven.cli.MavenCli.main(MavenCli.java:158)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:289)
at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:229)
at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:415)

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