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java.lang.NullPointerException: 	at org.apache.maven.plugin.DefaultPluginManager.addPlugin(DefaultPluginManager.java:292)	at org.apache.maven.plugin.DefaultPluginManager.verifyVersionedPlugin(DefaultPluginManager.java:198)	at org.apache.maven.plugin.DefaultPluginManager.verifyPlugin(DefaultPluginManager.java:163)	at org.apache.maven.lifecycle.DefaultLifecycleExecutor.verifyPlugin(DefaultLifecycleExecutor.java:1252)	at org.apache.maven.lifecycle.DefaultLifecycleExecutor.findArtifactTypeHandlers(DefaultLifecycleExecutor.java:1171)	at org.apache.maven.lifecycle.DefaultLifecycleExecutor.findExtensions(DefaultLifecycleExecutor.java:173)	at org.apache.maven.lifecycle.DefaultLifecycleExecutor.execute(DefaultLifecycleExecutor.java:138)	at org.apache.maven.lifecycle.LifecycleExecutorInterceptor.execute(LifecycleExecutorInterceptor.java:35)	at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:322)	at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:115)	at org.apache.maven.cli.MavenCli.main(MavenCli.java:256)	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:585)	at org.codehaus.classworlds.Launcher.launchEnhanced(Launcher.java:315)	at org.codehaus.classworlds.Launcher.launch(Launcher.java:255)	at hudson.maven.agent.Main.launch(Main.java:89)	at hudson.maven.MavenBuild$Builder.call(MavenBuild.java:172)	at hudson.maven.MavenBuild$Builder.call(MavenBuild.java:140)	at hudson.remoting.UserRequest.perform(UserRequest.java:57)	at hudson.remoting.UserRequest.perform(UserRequest.java:22)	at hudson.remoting.Request$2.run(Request.java:178)	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:650)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:675)	at java.lang.Thread.run(Thread.java:595)