java.lang.ClassNotFoundException: org.testng.eclipse.launch.tester.TestNGPropertyTester cannot be found by org.testng.eclipse_6.9.12.201607091356

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java.lang.ClassNotFoundException: org.testng.eclipse.launch.tester.TestNGPropertyTester cannot be found by org.testng.eclipse_6.9.12.201607091356
at org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:439)
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.core.internal.registry.osgi.RegistryStrategyOSGI.createExecutableExtension(RegistryStrategyOSGI.java:174)
at org.eclipse.core.internal.registry.ExtensionRegistry.createExecutableExtension(ExtensionRegistry.java:905)
at org.eclipse.core.internal.registry.ConfigurationElement.createExecutableExtension(ConfigurationElement.java:243)
at org.eclipse.core.internal.expressions.PropertyTesterDescriptor.instantiate(PropertyTesterDescriptor.java:96)
at org.eclipse.core.internal.expressions.TypeExtension.findTypeExtender(TypeExtension.java:97)
at org.eclipse.core.internal.expressions.TypeExtension.findTypeExtender(TypeExtension.java:147)
at org.eclipse.core.internal.expressions.TypeExtension.findTypeExtender(TypeExtension.java:130)
at org.eclipse.core.internal.expressions.TypeExtensionManager.getProperty(TypeExtensionManager.java:119)
at org.eclipse.core.internal.expressions.TestExpression.evaluate(TestExpression.java:97)
at org.eclipse.core.internal.expressions.CompositeExpression.evaluateAnd(CompositeExpression.java:53)
at org.eclipse.core.internal.expressions.IterateExpression.evaluate(IterateExpression.java:160)
at org.eclipse.core.internal.expressions.CompositeExpression.evaluateAnd(CompositeExpression.java:53)
at org.eclipse.core.internal.expressions.WithExpression.evaluate(WithExpression.java:75)
at org.eclipse.core.internal.expressions.CompositeExpression.evaluateAnd(CompositeExpression.java:53)
at org.eclipse.debug.internal.ui.launchConfigurations.LaunchShortcutExtension.evalEnablementExpression(LaunchShortcutExtension.java:281)
at org.eclipse.debug.ui.actions.ContextualLaunchAction.isApplicable(ContextualLaunchAction.java:287)
at org.eclipse.debug.ui.actions.ContextualLaunchAction.fillMenu(ContextualLaunchAction.java:218)
at org.eclipse.debug.ui.actions.ContextualLaunchAction$1.menuShown(ContextualLaunchAction.java:141)
at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:255)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
at org.eclipse.swt.widgets.Display.sendEvent(Display.java:4362)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1113)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1137)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1122)
at org.eclipse.jface.action.ActionContributionItem.copyMenu(ActionContributionItem.java:1276)
at org.eclipse.jface.action.ActionContributionItem.handleShowProxy(ActionContributionItem.java:1256)
at org.eclipse.jface.action.ActionContributionItem.access$4(ActionContributionItem.java:1245)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
at org.eclipse.swt.widgets.Display.sendEvent(Display.java:4362)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1113)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1137)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1118)
at org.eclipse.swt.widgets.Control.WM_INITMENUPOPUP(Control.java:5037)
at org.eclipse.swt.widgets.Control.windowProc(Control.java:4705)
at org.eclipse.swt.widgets.Canvas.windowProc(Canvas.java:339)
at org.eclipse.swt.widgets.Decorations.windowProc(Decorations.java:1633)
at org.eclipse.swt.widgets.Shell.windowProc(Shell.java:2117)
at org.eclipse.swt.internal.win32.OS.TrackPopupMenu(Native Method)

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