Hello,
i condensed changes then made changes and saved the image.
Now when i open squeak and try to open the process browser i get this  
error:

UndefinedObject(Object)>>doesNotUnderstand: #allInstVarNames
	Receiver: nil
	Arguments and temporary variables:
		aMessage: 	allInstVarNames
	Receiver's instance variables:
nil

Message>>sentTo:
	Receiver: allInstVarNames
	Arguments and temporary variables:
		receiver: 	nil
	Receiver's instance variables:
		selector: 	#allInstVarNames
		args: 	#()
		lookupClass: 	UndefinedObject

UndefinedObject(Object)>>doesNotUnderstand: #allInstVarNames
	Receiver: nil
	Arguments and temporary variables:
		aMessage: 	allInstVarNames
	Receiver's instance variables:
nil

Message>>sentTo:
	Receiver: allInstVarNames
	Arguments and temporary variables:
		receiver: 	nil
	Receiver's instance variables:
		selector: 	#allInstVarNames
		args: 	#()
		lookupClass: 	UndefinedObject


--- The full stack ---
UndefinedObject(Object)>>doesNotUnderstand: #allInstVarNames
Message>>sentTo:
UndefinedObject(Object)>>doesNotUnderstand: #allInstVarNames
Message>>sentTo:
  - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
UndefinedObject(Object)>>doesNotUnderstand: #allInstVarNames
Encoder>>init:context:notifying:
[] in Parser>>parse:class:noPattern:context:notifying:ifFail: {[methNode  
:= self     method: noPattern     context: ctxt     encoder: (Enco...]}
BlockContext>>on:do:
Parser>>parse:class:noPattern:context:notifying:ifFail:
Parser>>parse:class:
CompiledMethod>>methodNode
Decompiler>>decompileBlock:
BlockContext>>decompile
BlockContext>>printOn:
[] in BlockContext(Object)>>printStringLimitedTo: {[:s | self printOn: s]}
String class(SequenceableCollection class)>>streamContents:limitedTo:
BlockContext(Object)>>printStringLimitedTo:
BlockContext(Object)>>printString
BlockContext(Object)>>asString
[] in ProcessBrowser>>stackNameList {[:each | each asString]}
OrderedCollection>>collect:
ProcessBrowser>>stackNameList
PluggableListMorph>>getList
PluggableListMorph>>getListSize
LazyListMorph>>getListSize
LazyListMorph>>listChanged
PluggableListMorph>>updateList
PluggableListMorph>>on:list:selected:changeSelected:menu:keystroke:
PluggableListMorph class>>on:list:selected:changeSelected:menu:keystroke:
ProcessBrowser>>asPrototypeInWindow
ProcessBrowser class>>prototypicalToolWindow
ProcessBrowser class(Object)>>launchPartVia:label:
[] in IconicButton(SimpleButtonMorph)>>doButtonAction {[target perform:  
actionSelector withArguments: arguments]}
BlockContext>>ensure:
CursorWithMask(Cursor)>>showWhile:
IconicButton(SimpleButtonMorph)>>doButtonAction
EventHandler>>send:to:withEvent:fromMorph:
EventHandler>>startDrag:fromMorph:
IconicButton(Morph)>>startDrag:
MouseClickState>>drag:
MouseClickState>>handleEvent:from:
HandMorph>>handleEvent:
HandMorph>>processEvents
[] in WorldState>>doOneCycleNowFor: {[:h |  ActiveHand := h.  h  
processEvents.  capturingGesture := capturingGest...]}
Array(SequenceableCollection)>>do:
WorldState>>handsDo:
WorldState>>doOneCycleNowFor:
WorldState>>doOneCycleFor:
PasteUpMorph>>doOneCycle
[] in Project class>>spawnNewProcess {[[World doOneCycle.  Processor  
yield.  false] whileFalse.  nil]}
[] in BlockContext>>newProcess {[self value.  Processor terminateActive]}

Please help me :(

Bye.

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