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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.pmd.parser.PmdParser.parse(PmdParser.java:70)	at hudson.plugins.analysis.core.AbstractAnnotationParser.parse(AbstractAnnotationParser.java:53)	at hudson.plugins.analysis.core.FilesParser.parseFile(FilesParser.java:300)	at hudson.plugins.analysis.core.FilesParser.parseFiles(FilesParser.java:258)	at hudson.plugins.analysis.core.FilesParser.parserCollectionOfFiles(FilesParser.java:209)	at hudson.plugins.analysis.core.FilesParser.invoke(FilesParser.java:178)	at hudson.plugins.analysis.core.FilesParser.invoke(FilesParser.java:31)	at hudson.FilePath$FileCallableWrapper.call(FilePath.java:2474)	at hudson.remoting.UserRequest.perform(UserRequest.java:118)	at hudson.remoting.UserRequest.perform(UserRequest.java:48)	at hudson.remoting.Request$2.run(Request.java:328)	at hudson.remoting.InterceptingExecutorService$1.call(InterceptingExecutorService.java:72)	at java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source)	at java.util.concurrent.FutureTask.run(Unknown Source)	at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)	at hudson.remoting.Engine$1$1.run(Engine.java:63)	at java.lang.Thread.run(Unknown Source)