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java.lang.NullPointerException: 	at hudson.plugins.analysis.core.BuildHistory.getReferenceAction(BuildHistory.java:72)	at hudson.plugins.analysis.core.BuildHistory.getReferenceAnnotations(BuildHistory.java:57)	at hudson.plugins.analysis.core.BuildResult.initialize(BuildResult.java:254)	at hudson.plugins.analysis.core.BuildResult.(BuildResult.java:218)	at hudson.plugins.findbugs.FindBugsResult.(FindBugsResult.java:40)	at hudson.plugins.findbugs.FindBugsReporterResult.(FindBugsReporterResult.java:28)	at hudson.plugins.findbugs.FindBugsReporter.createResult(FindBugsReporter.java:175)	at hudson.plugins.findbugs.FindBugsReporter.createResult(FindBugsReporter.java:32)	at hudson.plugins.analysis.core.HealthAwareReporter.registerResults(HealthAwareReporter.java:269)	at hudson.plugins.analysis.core.HealthAwareReporter.access$000(HealthAwareReporter.java:56)	at hudson.plugins.analysis.core.HealthAwareReporter$1.call(HealthAwareReporter.java:258)	at hudson.plugins.analysis.core.HealthAwareReporter$1.call(HealthAwareReporter.java:256)	at hudson.maven.MavenBuild$ProxyImpl.execute(MavenBuild.java:394)	at hudson.maven.MavenBuild$ProxyImpl2.execute(MavenBuild.java:467)	at sun.reflect.GeneratedMethodAccessor282.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:597)	at hudson.model.Executor$1.call(Executor.java:514)	at hudson.util.InterceptingProxy$1.invoke(InterceptingProxy.java:23)	at undefined.$Proxy33.execute(Unknown Source)	at sun.reflect.GeneratedMethodAccessor420.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:597)	at hudson.remoting.RemoteInvocationHandler$RPCRequest.perform(RemoteInvocationHandler.java:274)	at hudson.remoting.RemoteInvocationHandler$RPCRequest.call(RemoteInvocationHandler.java:255)	at hudson.remoting.RemoteInvocationHandler$RPCRequest.call(RemoteInvocationHandler.java:215)	at hudson.remoting.UserRequest.perform(UserRequest.java:118)	at hudson.remoting.UserRequest.perform(UserRequest.java:48)	at hudson.remoting.Request$2.run(Request.java:287)	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)	at java.util.concurrent.FutureTask.run(FutureTask.java:138)	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)	at java.lang.Thread.run(Thread.java:662)