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java.lang.NullPointerException: 	at org.apache.commons.digester3.Digester.getXMLReader(Digester.java:799)	at org.apache.commons.digester3.Digester.parse(Digester.java:1642)	at org.apache.commons.digester3.Digester.parse(Digester.java:1701)	at hudson.plugins.checkstyle.rules.CheckStyleRules.initialize(CheckStyleRules.java:60)	at hudson.plugins.checkstyle.CheckStylePlugin.start(CheckStylePlugin.java:23)	at hudson.ClassicPluginStrategy.startPlugin(ClassicPluginStrategy.java:379)	at hudson.ClassicPluginStrategy.load(ClassicPluginStrategy.java:368)	at hudson.PluginManager$2$1$1.run(PluginManager.java:333)	at org.jvnet.hudson.reactor.TaskGraphBuilder$TaskImpl.run(TaskGraphBuilder.java:146)	at org.jvnet.hudson.reactor.Reactor.runTask(Reactor.java:259)	at jenkins.model.Jenkins$7.runTask(Jenkins.java:888)	at org.jvnet.hudson.reactor.Reactor$2.run(Reactor.java:187)	at org.jvnet.hudson.reactor.Reactor$Node.run(Reactor.java:94)	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:885)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:907)	at java.lang.Thread.run(Thread.java:619)