RTC Work Item error

Anyone have a clue as to what this error is as not been able to find anything on it.

Thanks

"Move Down" did not complete normally. Please see the log for more information.
TypeError: Cannot call method "equals" of null (RankingPlanItemSorter.is~306)

It occurs while in a Plan and using the Alt key and either the up or down arrows to move the order that a work item is displayed.

Full content of the error log.
eclipse.buildId=unknown
java.fullversion=J2RE 1.5.0 IBM J9 2.3 Windows XP x86-32 j9vmwi3223-20091104 (JIT enabled)
J9VM - 20091103_45935_lHdSMr
JIT - 20091016_1845_r8
GC - 20091026_AA
BootLoader constants: OS=win32, ARCH=x86, WS=win32, NL=en_GB
Framework arguments: -product com.ibm.team.concert.product
Command-line arguments: -os win32 -ws win32 -arch x86 -product com.ibm.team.concert.product


Error
Mon Oct 04 17:35:33 BST 2010
"Move Down" did not complete normally. Please see the log for more information.


There is also this error in the Log occurring at the same time and I wonder if this is more the route casue.

eclipse.buildId=unknown
java.fullversion=J2RE 1.5.0 IBM J9 2.3 Windows XP x86-32 j9vmwi3223-20091104 (JIT enabled)
J9VM - 20091103_45935_lHdSMr
JIT - 20091016_1845_r8
GC - 20091026_AA
BootLoader constants: OS=win32, ARCH=x86, WS=win32, NL=en_GB
Framework arguments: -product com.ibm.team.concert.product
Command-line arguments: -os win32 -ws win32 -arch x86 -product com.ibm.team.concert.product


Error
Mon Oct 04 17:35:33 BST 2010
TypeError: Cannot call method "equals" of null (RankingPlanItemSorter.js#306)

org.mozilla.javascript.EcmaError: TypeError: Cannot call method "equals" of null (RankingPlanItemSorter.js#306)
at org.mozilla.javascript.ScriptRuntime.constructError(ScriptRuntime.java:3350)
at org.mozilla.javascript.ScriptRuntime.constructError(ScriptRuntime.java:3340)
at org.mozilla.javascript.ScriptRuntime.typeError(ScriptRuntime.java:3356)
at org.mozilla.javascript.ScriptRuntime.typeError2(ScriptRuntime.java:3375)
at org.mozilla.javascript.ScriptRuntime.undefCallError(ScriptRuntime.java:3394)
at org.mozilla.javascript.ScriptRuntime.getPropFunctionAndThis(ScriptRuntime.java:2026)
at org.mozilla.javascript.gen.c92._c19(RankingPlanItemSorter.js:306)
at org.mozilla.javascript.gen.c92.call(RankingPlanItemSorter.js)
at org.mozilla.javascript.optimizer.OptRuntime.callN(OptRuntime.java:86)
at org.mozilla.javascript.gen.c92._c14(RankingPlanItemSorter.js:168)
at org.mozilla.javascript.gen.c92.call(RankingPlanItemSorter.js)
at org.mozilla.javascript.ContextFactory.doTopCall(ContextFactory.java:393)
at org.mozilla.javascript.ScriptRuntime.doTopCall(ScriptRuntime.java:2834)
at org.mozilla.javascript.gen.c92.call(RankingPlanItemSorter.js)
at org.mozilla.javascript.ScriptableObject.callMethod(ScriptableObject.java:1831)
at com.ibm.team.apt.internal.common.scripting.util.JSUtils.callMethod(JSUtils.java:89)
at com.ibm.team.apt.internal.ide.ui.scripting.interfaces.ScriptableSorter$9.run(ScriptableSorter.java:141)
at com.ibm.team.apt.internal.ide.ui.scripting.interfaces.ScriptableSorter$9.run(ScriptableSorter.java:1)
at com.ibm.team.apt.internal.common.scripting.environment.AbstractScriptEnvironment.execute(AbstractScriptEnvironment.java:62)
at com.ibm.team.apt.internal.ide.ui.scripting.interfaces.ScriptableSorter.move(ScriptableSorter.java:139)
at com.ibm.team.apt.internal.ide.ui.common.structure.JavaScriptItemMovePolicy.move(JavaScriptItemMovePolicy.java:547)
at com.ibm.team.apt.internal.ide.ui.common.structure.JavaScriptItemMovePolicy.access$1(JavaScriptItemMovePolicy.java:531)
at com.ibm.team.apt.internal.ide.ui.common.structure.JavaScriptItemMovePolicy$5$1.run(JavaScriptItemMovePolicy.java:352)
at com.ibm.team.apt.internal.ide.ui.common.structure.JavaScriptItemMovePolicy.preservingEditor(JavaScriptItemMovePolicy.java:635)
at com.ibm.team.apt.internal.ide.ui.common.structure.JavaScriptItemMovePolicy.access$2(JavaScriptItemMovePolicy.java:618)
at com.ibm.team.apt.internal.ide.ui.common.structure.JavaScriptItemMovePolicy$5.run(JavaScriptItemMovePolicy.java:348)
at com.ibm.team.apt.internal.ide.ui.common.structure.JavaScriptItemMovePolicy$5.run(JavaScriptItemMovePolicy.java:1)
at com.ibm.team.apt.internal.ide.ui.common.model.OutlineModel.updateModel(OutlineModel.java:377)
at com.ibm.team.apt.internal.ide.ui.common.structure.JavaScriptItemMovePolicy.executeMove(JavaScriptItemMovePolicy.java:346)
at com.ibm.team.apt.internal.ide.ui.common.structure.JavaScriptItemMovePolicy.moveDown(JavaScriptItemMovePolicy.java:200)
at com.ibm.team.apt.internal.ide.ui.actions.MovePlanItemDownAction.run(MovePlanItemDownAction.java:37)
at com.ibm.team.apt.internal.ide.ui.actions.PlanViewModelAction.run(PlanViewModelAction.java:89)
at org.eclipse.jface.action.Action.runWithEvent(Action.java:498)
at com.ibm.team.apt.internal.ide.ui.actions.RetargetAction.runWithEvent(RetargetAction.java:77)
at org.eclipse.jface.commands.ActionHandler.execute(ActionHandler.java:119)
at org.eclipse.core.commands.Command.executeWithChecks(Command.java:476)
at org.eclipse.core.commands.ParameterizedCommand.executeWithChecks(ParameterizedCommand.java:508)
at org.eclipse.ui.internal.handlers.HandlerService.executeCommand(HandlerService.java:169)
at org.eclipse.ui.internal.keys.WorkbenchKeyboard.executeCommand(WorkbenchKeyboard.java:472)
at org.eclipse.ui.internal.keys.WorkbenchKeyboard.press(WorkbenchKeyboard.java:824)
at org.eclipse.ui.internal.keys.WorkbenchKeyboard.processKeyEvent(WorkbenchKeyboard.java:882)
at org.eclipse.ui.internal.keys.WorkbenchKeyboard.filterKeySequenceBindings(WorkbenchKeyboard.java:571)
at org.eclipse.ui.internal.keys.WorkbenchKeyboard.access$3(WorkbenchKeyboard.java:512)
at org.eclipse.ui.internal.keys.WorkbenchKeyboard$KeyDownFilter.handleEvent(WorkbenchKeyboard.java:127)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
at org.eclipse.swt.widgets.Display.filterEvent(Display.java:1201)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1002)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1027)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1012)
at org.eclipse.swt.widgets.Widget.sendKeyEvent(Widget.java:1040)
at org.eclipse.swt.widgets.Widget.sendKeyEvent(Widget.java:1036)
at org.eclipse.swt.widgets.Widget.wmSysKeyDown(Widget.java:2421)
at org.eclipse.swt.widgets.Control.WM_SYSKEYDOWN(Control.java:4564)
at org.eclipse.swt.widgets.Control.windowProc(Control.java:3864)
at org.eclipse.swt.widgets.Canvas.windowProc(Canvas.java:337)
at org.eclipse.swt.widgets.Display.windowProc(Display.java:4558)
at org.eclipse.swt.internal.win32.OS.DispatchMessageW(Native Method)
at org.eclipse.swt.internal.win32.OS.DispatchMessage(OS.java:2371)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3437)
at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2384)
at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2348)
at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2200)
at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:495)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:288)
at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:490)
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:386)
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:79)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:618)
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)