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java.lang.NullPointerException: 	at org.eclipse.ui.trace.internal.utils.PreferenceHandler.isTracingEnabled(PreferenceHandler.java:108)	at org.eclipse.ui.trace.internal.TracingUIActivator.initPreferences(TracingUIActivator.java:100)	at org.eclipse.ui.trace.internal.TracingUIActivator.start(TracingUIActivator.java:69)	at org.eclipse.osgi.internal.framework.BundleContextImpl$3.run(BundleContextImpl.java:771)	at org.eclipse.osgi.internal.framework.BundleContextImpl$3.run(BundleContextImpl.java:1)	at java.security.AccessController.doPrivileged(Native Method)	at org.eclipse.osgi.internal.framework.BundleContextImpl.startActivator(BundleContextImpl.java:764)	at org.eclipse.osgi.internal.framework.BundleContextImpl.start(BundleContextImpl.java:721)	at org.eclipse.osgi.internal.framework.EquinoxBundle.startWorker0(EquinoxBundle.java:941)	at org.eclipse.osgi.internal.framework.EquinoxBundle$EquinoxModule.startWorker(EquinoxBundle.java:318)	at org.eclipse.osgi.container.Module.doStart(Module.java:571)	at org.eclipse.osgi.container.Module.start(Module.java:439)	at org.eclipse.osgi.framework.util.SecureAction.start(SecureAction.java:454)	at org.eclipse.osgi.internal.hooks.EclipseLazyStarter.postFindLocalClass(EclipseLazyStarter.java:107)	at org.eclipse.osgi.internal.loader.classpath.ClasspathManager.findLocalClass(ClasspathManager.java:531)	at org.eclipse.osgi.internal.loader.ModuleClassLoader.findLocalClass(ModuleClassLoader.java:324)	at org.eclipse.osgi.internal.loader.BundleLoader.findLocalClass(BundleLoader.java:327)	at org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:402)	at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:352)	at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:344)	at org.eclipse.osgi.internal.loader.ModuleClassLoader.loadClass(ModuleClassLoader.java:160)	at java.lang.ClassLoader.loadClass(Unknown Source)	at org.eclipse.osgi.internal.framework.EquinoxBundle.loadClass(EquinoxBundle.java:573)	at org.eclipse.equinox.internal.ds.model.ServiceComponent.createInstance(ServiceComponent.java:493)	at org.eclipse.equinox.internal.ds.model.ServiceComponentProp.createInstance(ServiceComponentProp.java:270)	at org.eclipse.equinox.internal.ds.model.ServiceComponentProp.build(ServiceComponentProp.java:331)	at org.eclipse.equinox.internal.ds.InstanceProcess.buildComponent(InstanceProcess.java:620)	at org.eclipse.equinox.internal.ds.InstanceProcess.buildComponents(InstanceProcess.java:197)	at org.eclipse.equinox.internal.ds.Resolver.buildNewlySatisfied(Resolver.java:473)	at org.eclipse.equinox.internal.ds.Resolver.enableComponents(Resolver.java:217)	at org.eclipse.equinox.internal.ds.SCRManager.performWork(SCRManager.java:816)	at org.eclipse.equinox.internal.ds.SCRManager$QueuedJob.dispatch(SCRManager.java:783)	at org.eclipse.equinox.internal.ds.WorkThread.run(WorkThread.java:89)	at java.lang.Thread.run(Unknown Source)