It looks like you have a nil object that's getting sent the message #categories. 

If you dive in with the debugger, somewhere near the top, you should be able to find your nil object. Nil has a way of begetting nil sometimes, so you may need to walk down the stack tract to find original the source of the error. 

If all else fails, you should be able to recover most if not all of your code from your .changes file.

On Nov 27, 2010, at 4:24 AM, recursive68@gmail.com wrote:

Hi

I've been using a Squeak 4.1 and Seaside 3.0 and I think I must have stuffed something up as now getting the following error:

MessageNotUnderstood: UndefinedObject>>categories
Proceed
Abandon
Debug
Create
UndefinedObject(Object)>>doesNotUnderstand: #categories
Browser>>messageCategoryList
PluggableListMorphPlus(PluggableListMorph)>>getList
PluggableListMorphPlus(PluggableListMorph)>>verifyContents
[] in Browser(Object)>>updateListsAndCodeIn:
Array(SequenceableCollection)>>do:
Browser(Object)>>updateListsAndCodeIn:
Browser(CodeHolder)>>updateListsAndCodeIn:
Browser(CodeHolder)>>modelWakeUpIn:
PluggableSystemWindow(SystemWindow)>>activateWindow
PluggableSystemWindow(SystemWindow)>>activate
SystemWindow class>>noteTopWindowIn:
PluggableSystemWindow(SystemWindow)>>delete
PluggableSystemWindow>>delete
MorphicToolBuilder>>close:
Debugger>>debug
PluggableButtonMorphPlus(PluggableButtonMorph)>>performAction
PluggableButtonMorphPlus>>performAction
[] in PluggableButtonMorphPlus(PluggableButtonMorph)>>mouseUp:
Array(SequenceableCollection)>>do:

UndefinedObject(Object)>>doesNotUnderstand: #categories
Browser>>messageCategoryList
PluggableListMorphPlus(PluggableListMorph)>>getList
PluggableListMorphPlus(PluggableListMorph)>>verifyContents
[] in Browser(Object)>>updateListsAndCodeIn:
Array(SequenceableCollection)>>do:
Browser(Object)>>updateListsAndCodeIn:
Browser(CodeHolder)>>updateListsAndCodeIn:
Browser(CodeHolder)>>modelWakeUpIn:
PluggableSystemWindow(SystemWindow)>>activateWindow
PluggableSystemWindow(SystemWindow)>>activate
SystemWindow class>>noteTopWindowIn:
PluggableSystemWindow(SystemWindow)>>delete
PluggableSystemWindow>>delete
MorphicToolBuilder>>close:
Debugger>>debug
PluggableButtonMorphPlus(PluggableButtonMorph)>>performAction
PluggableButtonMorphPlus>>performAction
[] in PluggableButtonMorphPlus(PluggableButtonMorph)>>mouseUp:
Array(SequenceableCollection)>>do:

I would just use a new copy of the image but I need to fileout some package I've written but this error is stopping me from doing so. Any ideas ?

Thanks
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