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I get the following exception quite often running mylyn in Ganymede on OSX. Is there more information that I should provide? java.lang.NoClassDefFoundError at org.eclipse.mylyn.tasks.ui.TaskElementLabelProvider.getFont(TaskElementLabelProvider.java:259) at org.eclipse.jface.viewers.DecoratingLabelProvider.getFont(DecoratingLabelProvider.java:278) at org.eclipse.mylyn.internal.tasks.ui.views.TaskTableLabelProvider.getFont(TaskTableLabelProvider.java:71) at org.eclipse.jface.viewers.TableColumnViewerLabelProvider.update(TableColumnViewerLabelProvider.java:92) at org.eclipse.jface.viewers.ViewerColumn.refresh(ViewerColumn.java:145) at org.eclipse.jface.viewers.AbstractTreeViewer.doUpdateItem(AbstractTreeViewer.java:932) at org.eclipse.jface.viewers.AbstractTreeViewer$UpdateItemSafeRunnable.run(AbstractTreeViewer.java:102) at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:37) at org.eclipse.core.runtime.Platform.run(Platform.java:880) at org.eclipse.ui.internal.JFaceUtil$1.run(JFaceUtil.java:48) at org.eclipse.jface.util.SafeRunnable.run(SafeRunnable.java:175) at org.eclipse.jface.viewers.AbstractTreeViewer.doUpdateItem(AbstractTreeViewer.java:1012) at org.eclipse.jface.viewers.StructuredViewer$UpdateItemSafeRunnable.run(StructuredViewer.java:466) at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:37) at org.eclipse.core.runtime.Platform.run(Platform.java:880) at org.eclipse.ui.internal.JFaceUtil$1.run(JFaceUtil.java:48) at org.eclipse.jface.util.SafeRunnable.run(SafeRunnable.java:175) at org.eclipse.jface.viewers.StructuredViewer.updateItem(StructuredViewer.java:2041) at org.eclipse.jface.viewers.AbstractTreeViewer.updateChildren(AbstractTreeViewer.java:2675) at org.eclipse.jface.viewers.AbstractTreeViewer.internalRefreshStruct(AbstractTreeViewer.java:1856) at org.eclipse.jface.viewers.TreeViewer.internalRefreshStruct(TreeViewer.java:711) at org.eclipse.jface.viewers.AbstractTreeViewer.internalRefresh(AbstractTreeViewer.java:1831) at org.eclipse.jface.viewers.AbstractTreeViewer.internalRefresh(AbstractTreeViewer.java:1787) at org.eclipse.jface.viewers.StructuredViewer$8.run(StructuredViewer.java:1457) at org.eclipse.jface.viewers.StructuredViewer.preservingSelection(StructuredViewer.java:1365) at org.eclipse.jface.viewers.TreeViewer.preservingSelection(TreeViewer.java:397) at org.eclipse.jface.viewers.StructuredViewer.preservingSelection(StructuredViewer.java:1328) at org.eclipse.jface.viewers.StructuredViewer.refresh(StructuredViewer.java:1455) at org.eclipse.jface.viewers.ColumnViewer.refresh(ColumnViewer.java:548) at org.eclipse.ui.dialogs.FilteredTree$NotifyingTreeViewer.refresh(FilteredTree.java:931) at org.eclipse.jface.viewers.StructuredViewer.refresh(StructuredViewer.java:1412) at org.eclipse.ui.dialogs.FilteredTree$NotifyingTreeViewer.refresh(FilteredTree.java:921) at org.eclipse.mylyn.internal.tasks.ui.views.TaskListView$TaskListRefreshJob.doRefresh(TaskListView.java:197) at org.eclipse.mylyn.internal.provisional.commons.ui.DelayedRefreshJob.runInUIThread(DelayedRefreshJob.java:93) at org.eclipse.ui.progress.UIJob$1.run(UIJob.java:94) at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:35) at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:133) at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:3338) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3067) at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2382) at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2346) at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2198) at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:493) at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:288) at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:488) at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149) at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:113) at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:193) 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:382) 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:585) at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:549) at org.eclipse.equinox.launcher.Main.basicRun(Main.java:504) at org.eclipse.equinox.launcher.Main.run(Main.java:1236)
This might be caused by an incomplete or inconsistent installation of Mylyn. Could you list the Mylyn features and plug-ins that you have installed from About > Configuration Details?
*** This bug has been marked as a duplicate of bug 240076 ***