walkback getting unimplemented methods

> Using Community Edition 6.0.2, I get this walkback from a straight
> Community Edition.img.
>
>  From Package Browser>>Browse>>Unimplemented Messages.
>
> Looks like PackageEnvironment>>includesSelector:in: is sending
> #methodFor: which is not implemented in my image.
>
> What is an unimplemented method anyway? thx. I couldn't find any help on
> it.
>
> Eric
>
> 11:53:50 AM, Saturday, August 19, 2006: 'Object class does not
> understand #methodFor:'
> Object class(Object)>>doesNotUnderstand:
> PackageEnvironment>>includesSelector:in:
> [] in PluggableEnvironment>>selectorsForClass:do:
> MethodDictionary(LookupTable)>>keysAndValuesDo:
> Object class(Behavior)>>selectorsAndMethodsDo:
> PluggableEnvironment>>selectorsForClass:do:
> [] in PluggableEnvironment>>classesAndSelectorsDo:
> [] in SystemDictionary>>allBehaviorsDo:
> OrderedCollection>>do:
> SystemDictionary>>allBehaviorsDo:
> PluggableEnvironment(BrowserEnvironment)>>allClassesDo:
> PluggableEnvironment>>classesAndSelectorsDo:
> PluggableEnvironment(BrowserEnvironment)>>methodsDo:
> PluggableEnvironment(BrowserEnvironment)>>allMethods
> [] in MethodBrowser>>methods:
> BlockClosure>>ifCurtailed:
> BlockClosure>>ensure:
> Cursor>>showWhile:
> MethodBrowser>>methods:
> MethodExplorerShell>>onTreeSelectionChanged
> EventMessageSend>>forwardTo:withArguments:
> EventMessageSend>>value
> [] in MessageSequenceAbstract>>value
> EventMessageSequence>>messagesDo:
> EventMessageSequence(MessageSequenceAbstract)>>value
> EventsCollection>>triggerEvent:
> TreePresenter(Object)>>trigger:
> TreeView(ListControlView)>>onSelectionChanged
> TreePresenter(SelectableItemsPresenter)>>onSelectionChanged
> TreeView(ListControlView)>>onSelChanged:
> TreeView(IconicListAbstract)>>nmSelChanged:
> TreeView>>nmNotify:
> SlidingCardTray(View)>>wmNotify:wParam:lParam:
> SlidingCardTray(View)>>dispatchMessage:wParam:lParam:
> [] in InputState>>wndProc:message:wParam:lParam:cookie:
> BlockClosure>>ifCurtailed:
> ProcessorScheduler>>callback:evaluate:
> InputState>>wndProc:message:wParam:lParam:cookie:
> TreeView(ControlView)>>defaultWindowProcessing:wParam:lParam:
> TreeView(View)>>dispatchMessage:wParam:lParam:
> [] in InputState>>wndProc:message:wParam:lParam:cookie:
> BlockClosure>>ifCurtailed:
> ProcessorScheduler>>callback:evaluate:
> InputState>>wndProc:message:wParam:lParam:cookie:
> TreeView(View)>>sendMessage:wParam:lParam:
> TreeView>>setSingleSelection:
> TreeView>>selectionByIndex:ifAbsent:
> TreeView>>selection:ifAbsent:
> TreePresenter(SelectableItemsPresenter)>>selection:
> MethodExplorerShell>>browseMethodsInEnvironments: