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java.lang.NullPointerException: 	at org.eclipse.core.runtime.Path.append(Path.java:261)	at net.sf.eclipsecs.core.config.configtypes.RemoteConfigurationType.writeToCacheFile(RemoteConfigurationType.java:270)	at net.sf.eclipsecs.core.config.configtypes.RemoteConfigurationType.getCheckstyleConfiguration(RemoteConfigurationType.java:147)	at net.sf.eclipsecs.core.config.CheckConfiguration.getCheckstyleConfiguration(CheckConfiguration.java:202)	at net.sf.eclipsecs.core.builder.CheckerFactory.getCacheKey(CheckerFactory.java:231)	at net.sf.eclipsecs.core.builder.CheckerFactory.createChecker(CheckerFactory.java:123)	at net.sf.eclipsecs.core.builder.Auditor.runAudit(Auditor.java:140)	at net.sf.eclipsecs.core.builder.CheckstyleBuilder.handleBuildSelection(CheckstyleBuilder.java:287)	at net.sf.eclipsecs.core.builder.CheckstyleBuilder.build(CheckstyleBuilder.java:168)	at org.eclipse.core.internal.events.BuildManager$2.run(BuildManager.java:728)	at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)	at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:199)	at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:239)	at org.eclipse.core.internal.events.BuildManager$1.run(BuildManager.java:292)	at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)	at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:295)	at org.eclipse.core.internal.events.BuildManager.basicBuildLoop(BuildManager.java:351)	at org.eclipse.core.internal.events.BuildManager.build(BuildManager.java:374)	at org.eclipse.core.internal.events.AutoBuildJob.doBuild(AutoBuildJob.java:143)	at org.eclipse.core.internal.events.AutoBuildJob.run(AutoBuildJob.java:241)	at org.eclipse.core.internal.jobs.Worker.run(Worker.java:54)