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java.lang.NullPointerException: 	at org.apache.maven.scm.provider.clearcase.command.changelog.ClearCaseChangeLogCommand.executeChangeLogCommand(ClearCaseChangeLogCommand.java:51)	at org.apache.maven.scm.command.changelog.AbstractChangeLogCommand.executeCommand(AbstractChangeLogCommand.java:63)	at org.apache.maven.scm.command.update.AbstractUpdateCommand.executeCommand(AbstractUpdateCommand.java:60)	at org.apache.maven.scm.command.AbstractCommand.execute(AbstractCommand.java:55)	at org.apache.maven.scm.provider.clearcase.ClearCaseScmProvider.update(ClearCaseScmProvider.java:117)	at org.apache.maven.scm.provider.AbstractScmProvider.update(AbstractScmProvider.java:293)	at org.apache.maven.scm.plugin.UpdateMojo.execute(UpdateMojo.java:66)	at org.apache.maven.plugin.DefaultPluginManager.executeMojo(DefaultPluginManager.java:399)	at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoals(DefaultLifecycleExecutor.java:519)	at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeStandaloneGoal(DefaultLifecycleExecutor.java:482)	at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoal(DefaultLifecycleExecutor.java:452)	at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalAndHandleFailures(DefaultLifecycleExecutor.java:301)	at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeTaskSegments(DefaultLifecycleExecutor.java:214)	at org.apache.maven.lifecycle.DefaultLifecycleExecutor.execute(DefaultLifecycleExecutor.java:137)	at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:316)	at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:113)	at org.apache.maven.cli.MavenCli.main(MavenCli.java:249)	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:324)	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)