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Failed to execute runnable (java.lang.IllegalArgumentException: Argument not valid)
java.lang.NullPointerException: 	at org.eclipse.mylyn.internal.monitor.ui.ActivityContextManager$3.run(ActivityContextManager.java:110)	at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:35)	at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:134)	at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:3515)	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3164)	at org.eclipse.jdt.testplugin.JavaProjectHelper.emptyDisplayLoop(JavaProjectHelper.java:806)	at org.eclipse.jdt.testplugin.JavaProjectHelper.delete(JavaProjectHelper.java:274)	at org.eclipse.jdt.ui.tests.refactoring.RefactoringTestSetup.tearDown(RefactoringTestSetup.java:85)	at junit.extensions.TestSetup$1.protect(TestSetup.java:24)	at junit.framework.TestResult.runProtected(TestResult.java:128)	at junit.extensions.TestSetup.run(TestSetup.java:27)	at junit.framework.TestSuite.runTest(TestSuite.java:232)	at junit.framework.TestSuite.run(TestSuite.java:227)	at junit.framework.TestSuite.runTest(TestSuite.java:232)	at junit.framework.TestSuite.run(TestSuite.java:227)	at junit.extensions.TestDecorator.basicRun(TestDecorator.java:24)	at junit.extensions.TestSetup$1.protect(TestSetup.java:23)	at junit.framework.TestResult.runProtected(TestResult.java:128)	at junit.extensions.TestSetup.run(TestSetup.java:27)	at org.eclipse.jdt.internal.junit.runner.junit3.JUnit3TestReference.run(JUnit3TestReference.java:130)	at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)	at org.eclipse.pde.internal.junit.runtime.RemotePluginTestRunner.main(RemotePluginTestRunner.java:62)	at org.eclipse.pde.internal.junit.runtime.UITestApplication$1.run(UITestApplication.java:116)	at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:35)	at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:134)	at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:3515)	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3164)	at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2640)	at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2604)	at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2438)	at org.eclipse.ui.internal.Workbench$7.run(Workbench.java:671)	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)	at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:664)	at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)	at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:115)	at org.eclipse.pde.internal.junit.runtime.UITestApplication.start(UITestApplication.java:47)	at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196)	at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110)	at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79)	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:369)	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179)	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:597)	at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:619)	at org.eclipse.equinox.launcher.Main.basicRun(Main.java:574)	at org.eclipse.equinox.launcher.Main.run(Main.java:1407)	at org.eclipse.equinox.launcher.Main.main(Main.java:1383)