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java.lang.NullPointerException: 	at java.util.Calendar.setTime(Calendar.java:1037)	at java.text.SimpleDateFormat.format(SimpleDateFormat.java:803)	at java.text.SimpleDateFormat.format(SimpleDateFormat.java:796)	at java.text.DateFormat.format(DateFormat.java:314)	at org.sonar.plugins.scmactivity.BlameSensor.formatLastActivity(BlameSensor.java:112)	at org.sonar.plugins.scmactivity.BlameSensor.analyseBlame(BlameSensor.java:83)	at org.sonar.plugins.scmactivity.BlameSensor.analyse(BlameSensor.java:56)	at org.sonar.plugins.scmactivity.ScmActivitySensor.analyse(ScmActivitySensor.java:77)	at org.sonar.batch.SensorsExecutor.execute(SensorsExecutor.java:58)	at org.sonar.batch.ProjectBatch.execute(ProjectBatch.java:53)	at org.sonar.batch.Batch.analyzeProject(Batch.java:112)	at org.sonar.batch.Batch.analyzeProject(Batch.java:109)	at org.sonar.batch.Batch.analyzeProject(Batch.java:109)	at org.sonar.batch.Batch.analyzeProjects(Batch.java:81)	at org.sonar.batch.Batch.execute(Batch.java:57)	at org.sonar.maven.SonarMojo.executeBatch(SonarMojo.java:142)	at org.sonar.maven.SonarMojo.execute(SonarMojo.java:133)	at org.apache.maven.plugin.DefaultPluginManager.executeMojo(DefaultPluginManager.java:451)	at org.codehaus.mojo.sonar.Bootstraper.executeMojo(Bootstraper.java:98)	at org.codehaus.mojo.sonar.Bootstraper.start(Bootstraper.java:79)	at org.codehaus.mojo.sonar.SonarMojo.execute(SonarMojo.java:88)	at org.apache.maven.plugin.DefaultPluginManager.executeMojo(DefaultPluginManager.java:451)	at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoals(DefaultLifecycleExecutor.java:558)	at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeStandaloneGoal(DefaultLifecycleExecutor.java:512)	at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoal(DefaultLifecycleExecutor.java:482)	at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalAndHandleFailures(DefaultLifecycleExecutor.java:330)	at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeTaskSegments(DefaultLifecycleExecutor.java:227)	at org.apache.maven.lifecycle.DefaultLifecycleExecutor.execute(DefaultLifecycleExecutor.java:142)	at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:336)	at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:129)	at org.apache.maven.cli.MavenCli.main(MavenCli.java:287)	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:592)	at org.codehaus.classworlds.Launcher.launchEnhanced(Launcher.java:315)	at org.codehaus.classworlds.Launcher.launch(Launcher.java:255)	at org.codehaus.classworlds.Launcher.mainWithExitCode(Launcher.java:430)	at org.codehaus.classworlds.Launcher.main(Launcher.java:375)