Oh, and if it helps, here is the NS stack trace:

12 May 2018 6:49:05.568884 pm

VM: Mac OS - Smalltalk
Image: Squeak5.1 [latest update: #16548]

SecurityManager state:
Restricted: false
FileAccess: true
SocketAccess: true
Working Dir /Users/gbracha/newspeak/dev/2017-09-05
Trusted Dir /foobar/tooBar/forSqueak/bogus/
Untrusted Dir /Users/gbracha/Library/Preferences/Newspeak/Internet/Untrusted/

NSMethodActivationMirror(Object)>>doesNotUnderstand: #errorReportOn:
Receiver: NSMethodActivationMirror#204875
Arguments and temporary variables:
<
Receiver's instance variables:
lowLevelActivationMirror: Historian(Object) doesNotUnderstand: #insertErrorHandlingForTrackingAHistorianWhenALocalHistorianWithTheGivenNameAlreadyExists...etc...
threadMirror: ThreadMirror:thread Refreshing: /Users/gbracha/newspeak/dev/newsp...etc...
senderSlot: NSMethodActivationMirror#2945733
homeSlot: NSMethodActivationMirror#3578074

[] in Debugging(Debugging)>>defaultErrorReportFor:
Receiver: Debugging#3890693
Arguments and temporary variables:
<
Receiver's instance variables:
Gradient: Gradient1278394 RectangleShape: RectangleShape18395
Row: Row742158 HopscotchImages: HopscotchImages LeafFragment: LeafFragment582535
Subject: Subject582535 TextEditorFragment: TextEditorFragment1173864
MixinBuilder: MixinBuilder306537 ObjectMirror: ObjectMirror306537
CodeEditorFragment: CodeEditorFragment1862673 ExpandableMethodPresenter: ExpandableMethodPresenter2638982
IDEWindow: IDEWindow1862673 MethodSubject: MethodSubject2638982
NSMethodInheritanceSubject: NSMethodInheritanceSubject1207680 InitializerMethodSubject: InitializerMethodSubject1207680
OneLineDefinitionTemplate: OneLineDefinitionTemplate1862673 ProgrammingPresenter: ProgrammingPresenter1862673
ObjectSubject: ObjectSubject1252258 ExceptionalResultPresenter: ExceptionalResultPresenter1252258
workspaceManager: Future#4123886
ide: HopscotchIDE3797369#966687 Color: Color List: MutableArrayList1058316
SqueakDebugger: Debugger
TextColor: TextColor
TextEmphasis: TextEmphasis
UnhandledError: UnhandledError
Semaphore: Semaphore
errorReportBlock: [closure] in Debugging(Debugging)>>initializerusingPlatform:ide:...etc... methodSourceRatio: (8/5) Debuggerslot: Debugger`3890693

String class(SequenceableCollection class)>>new:streamContents:
Receiver: String
Arguments and temporary variables:
newSize: 100
blockWithArg: [closure] in Debugging(Debugging)>>defaultErrorReportFor:
stream: a WriteStream
originalContents: nil
Receiver's instance variables:
superclass: ArrayedCollection
methodDict: a MethodDictionary(size 286)
format: 0
instanceVariables: nil
organization: ('accessing' byteAt: byteAt:put: byteSize do:toFieldNumber: findAnySubStr:startingAt:...etc...
subclasses: {ByteString . WideString . Symbol}
name: #String
classPool: a Dictionary(#AsciiOrder->#[0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16...etc...
sharedPools: nil
environment: Smalltalk
category: #'Collections-Strings'

String class(SequenceableCollection class)>>streamContents:
Receiver: String
Arguments and temporary variables:
blockWithArg: [closure] in Debugging(Debugging)>>defaultErrorReportFor:
Receiver's instance variables:
superclass: ArrayedCollection
methodDict: a MethodDictionary(size 286)
format: 0
instanceVariables: nil
organization: ('accessing' byteAt: byteAt:put: byteSize do:toFieldNumber: findAnySubStr:startingAt:...etc...
subclasses: {ByteString . WideString . Symbol}
name: #String
classPool: a Dictionary(#AsciiOrder->#[0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16...etc...
sharedPools: nil
environment: Smalltalk
category: #'Collections-Strings'

Debugging(Debugging)>>defaultErrorReportFor:
Receiver: Debugging#3890693
Arguments and temporary variables:
<
Receiver's instance variables:
Gradient: Gradient1278394 RectangleShape: RectangleShape18395
Row: Row742158 HopscotchImages: HopscotchImages LeafFragment: LeafFragment582535
Subject: Subject582535 TextEditorFragment: TextEditorFragment1173864
MixinBuilder: MixinBuilder306537 ObjectMirror: ObjectMirror306537
CodeEditorFragment: CodeEditorFragment1862673 ExpandableMethodPresenter: ExpandableMethodPresenter2638982
IDEWindow: IDEWindow1862673 MethodSubject: MethodSubject2638982
NSMethodInheritanceSubject: NSMethodInheritanceSubject1207680 InitializerMethodSubject: InitializerMethodSubject1207680
OneLineDefinitionTemplate: OneLineDefinitionTemplate1862673 ProgrammingPresenter: ProgrammingPresenter1862673
ObjectSubject: ObjectSubject1252258 ExceptionalResultPresenter: ExceptionalResultPresenter1252258
workspaceManager: Future#4123886
ide: HopscotchIDE3797369#966687 Color: Color List: MutableArrayList1058316
SqueakDebugger: Debugger
TextColor: TextColor
TextEmphasis: TextEmphasis
UnhandledError: UnhandledError
Semaphore: Semaphore
errorReportBlock: [closure] in Debugging(Debugging)>>initializerusingPlatform:ide:...etc... methodSourceRatio: (8/5) Debuggerslot: Debugger`3890693

[] in Debugging(Debugging)>>initializerusingPlatform:ide: Receiver: Debugging#3890693 Arguments and temporary variables: <<error during printing> Receiver's instance variables: Gradient: Gradient1278394
RectangleShape: RectangleShape18395 Row: Row742158
HopscotchImages: HopscotchImages
LeafFragment: LeafFragment582535 Subject: Subject582535
TextEditorFragment: TextEditorFragment1173864 MixinBuilder: MixinBuilder306537
ObjectMirror: ObjectMirror306537 CodeEditorFragment: CodeEditorFragment1862673
ExpandableMethodPresenter: ExpandableMethodPresenter2638982 IDEWindow: IDEWindow1862673
MethodSubject: MethodSubject2638982 NSMethodInheritanceSubject: NSMethodInheritanceSubject1207680
InitializerMethodSubject: InitializerMethodSubject1207680 OneLineDefinitionTemplate: OneLineDefinitionTemplate1862673
ProgrammingPresenter: ProgrammingPresenter1862673 ObjectSubject: ObjectSubject1252258
ExceptionalResultPresenter: ExceptionalResultPresenter1252258 workspaceManager: Future#4123886 ide: HopscotchIDE3797369#966687
Color: Color
List: MutableArrayList1058316 SqueakDebugger: Debugger TextColor: TextColor TextEmphasis: TextEmphasis UnhandledError: UnhandledError Semaphore: Semaphore errorReportBlock: [closure] in Debugging(Debugging)>>initializerusingPlatform:ide:...etc...
methodSourceRatio: (8/5)
Debuggerslot: Debugger3890693

ThreadSubject3271994(ThreadSubject)>>errorReport Receiver: ThreadSubject3271994#2206047(ThreadMirror:thread Refreshing: /Users/gbracha/newspeak/dev/...etc...
Arguments and temporary variables:
<
Receiver's instance variables:
model: ThreadMirror:thread Refreshing: /Users/gbracha/newspeak/dev/newspeak
presenterX: ThreadPresenter3271994#2065745(ThreadSubject3271994#2206047(ThreadMirror:...etc...

[] in ThreadPresenter3271994(ThreadPresenter)>>definitionForErrorReport Receiver: ThreadPresenter3271994#2065745(ThreadSubject3271994#2206047(ThreadMirror:thread Refreshi...etc... Arguments and temporary variables: <<error during printing> Receiver's instance variables: parentX: IDEWindow1862673#182824
visualX: VerticalViewport742158#2503994 in Frame1084575#3188781
decorators: nil
subject: ThreadSubject3271994#2206047(ThreadMirror:thread Refreshing: /Users/g...etc... substanceX: HolderComposer3332090#3231613
noticeHandlerSelectorsX: nil
activations: PresenterList582535#1690850 definitionHolder: HolderComposer3332090#3231613
moreLinkHolder: HolderComposer`3332090#1717904

[] in DisclosureComposer3332090(DisclosureComposer)>>privateExpand Receiver: DisclosureComposer3332090#3431751
Arguments and temporary variables:
<
Receiver's instance variables:
parentX: ColumnComposer3332090#796329 visualX: Column742158#4085398 in ColumnCell1084575#2539260 size: nil expansibility: ...etc... decorators: nil expandedX: true togglePermission: [closure] in DisclosureComposer3332090(TwoStateComposer)>>initializernew...etc... onAboutToToggle: nil onToggled: nil retainInvisiblePart: nil toggleIconX: ActiveIcon18395#313275 in Anchor1084575#1372959 onUserToggled: nil useExplorerLikeImages: false header: HyperlinkFragment1173864#2469264
bodyDefinition: [closure] in ThreadPresenter3271994(ThreadPresenter)>>definitionForErrorReport...etc... bodyPresenter: nil contentHolder: Wrapper742158#2487826 in RowCell`1084575#4082965 size: nil expansibility: ...etc...

UndefinedObject>>ifNil:
Receiver: nil
Arguments and temporary variables:
aBlock: [closure] in DisclosureComposer`3332090(DisclosureComposer)>>privateExpand...etc...
Receiver's instance variables:
nil

DisclosureComposer3332090(DisclosureComposer)>>privateExpand Receiver: DisclosureComposer3332090#3431751
Arguments and temporary variables:
<
Receiver's instance variables:
parentX: ColumnComposer3332090#796329 visualX: Column742158#4085398 in ColumnCell1084575#2539260 size: nil expansibility: ...etc... decorators: nil expandedX: true togglePermission: [closure] in DisclosureComposer3332090(TwoStateComposer)>>initializernew...etc... onAboutToToggle: nil onToggled: nil retainInvisiblePart: nil toggleIconX: ActiveIcon18395#313275 in Anchor1084575#1372959 onUserToggled: nil useExplorerLikeImages: false header: HyperlinkFragment1173864#2469264
bodyDefinition: [closure] in ThreadPresenter3271994(ThreadPresenter)>>definitionForErrorReport...etc... bodyPresenter: nil contentHolder: Wrapper742158#2487826 in RowCell`1084575#4082965 size: nil expansibility: ...etc...

DisclosureComposer3332090(TwoStateComposer)>>expanded: Receiver: DisclosureComposer3332090#3431751
Arguments and temporary variables:
<
Receiver's instance variables:
parentX: ColumnComposer3332090#796329 visualX: Column742158#4085398 in ColumnCell1084575#2539260 size: nil expansibility: ...etc... decorators: nil expandedX: true togglePermission: [closure] in DisclosureComposer3332090(TwoStateComposer)>>initializernew...etc... onAboutToToggle: nil onToggled: nil retainInvisiblePart: nil toggleIconX: ActiveIcon18395#313275 in Anchor1084575#1372959 onUserToggled: nil useExplorerLikeImages: false header: HyperlinkFragment1173864#2469264
bodyDefinition: [closure] in ThreadPresenter3271994(ThreadPresenter)>>definitionForErrorReport...etc... bodyPresenter: nil contentHolder: Wrapper742158#2487826 in RowCell`1084575#4082965 size: nil expansibility: ...etc...

DisclosureComposer3332090(TwoStateComposer)>>toggle Receiver: DisclosureComposer3332090#3431751
Arguments and temporary variables:
<
Receiver's instance variables:
parentX: ColumnComposer3332090#796329 visualX: Column742158#4085398 in ColumnCell1084575#2539260 size: nil expansibility: ...etc... decorators: nil expandedX: true togglePermission: [closure] in DisclosureComposer3332090(TwoStateComposer)>>initializernew...etc... onAboutToToggle: nil onToggled: nil retainInvisiblePart: nil toggleIconX: ActiveIcon18395#313275 in Anchor1084575#1372959 onUserToggled: nil useExplorerLikeImages: false header: HyperlinkFragment1173864#2469264
bodyDefinition: [closure] in ThreadPresenter3271994(ThreadPresenter)>>definitionForErrorReport...etc... bodyPresenter: nil contentHolder: Wrapper742158#2487826 in RowCell`1084575#4082965 size: nil expansibility: ...etc...

DisclosureComposer3332090(TwoStateComposerWithToggleIcon)>>userToggle Receiver: DisclosureComposer3332090#3431751
Arguments and temporary variables:
<
Receiver's instance variables:
parentX: ColumnComposer3332090#796329 visualX: Column742158#4085398 in ColumnCell1084575#2539260 size: nil expansibility: ...etc... decorators: nil expandedX: true togglePermission: [closure] in DisclosureComposer3332090(TwoStateComposer)>>initializernew...etc... onAboutToToggle: nil onToggled: nil retainInvisiblePart: nil toggleIconX: ActiveIcon18395#313275 in Anchor1084575#1372959 onUserToggled: nil useExplorerLikeImages: false header: HyperlinkFragment1173864#2469264
bodyDefinition: [closure] in ThreadPresenter3271994(ThreadPresenter)>>definitionForErrorReport...etc... bodyPresenter: nil contentHolder: Wrapper742158#2487826 in RowCell`1084575#4082965 size: nil expansibility: ...etc...

[] in ThreadPresenter3271994(ThreadPresenter)>>definitionForErrorReport Receiver: ThreadPresenter3271994#2065745(ThreadSubject3271994#2206047(ThreadMirror:thread Refreshi...etc... Arguments and temporary variables: <<error during printing> Receiver's instance variables: parentX: IDEWindow1862673#182824
visualX: VerticalViewport742158#2503994 in Frame1084575#3188781
decorators: nil
subject: ThreadSubject3271994#2206047(ThreadMirror:thread Refreshing: /Users/g...etc... substanceX: HolderComposer3332090#3231613
noticeHandlerSelectorsX: nil
activations: PresenterList582535#1690850 definitionHolder: HolderComposer3332090#3231613
moreLinkHolder: HolderComposer`3332090#1717904

[] in Hyperlink18395(Hyperlink)>>doAction Receiver: Hyperlink18395#775106 in RowCell1084575#3906277 size: nil expansibility: 1 compressibility: ...etc... Arguments and temporary variables: <<error during printing> Receiver's instance variables: parent: Row742158#3019387 in ColumnCell1084575#4161172 size: nil expansibility: ...etc... agent: a HyperlinkMorphicAgent owner: nil visibleA: Attribute1278394#1004462 true
duct: Duct2701957#4127193 of: Hyperlink18395#775106 in RowCell1084575#390627...etc... area: RowCell1084575#3906277 size: nil expansibility: 1 compressibility: 1
boundsH: MappableHolder1278394#344753 13@0 corner: 937@15 updateLockLevel: 0 currentNaturalExtent: 77@15 textA: Attribute1278394#1943502 #'Error Report'
fontA: Attribute1278394#3404420 Font1278394#3599731
colorA: Attribute1278394#2049575 Color black hoverColorA: Attribute1278394#3596232 (Color r: 0.0 g: 0.0 b: 0.9)
downColorA: Attribute1278394#1962138 (Color r: 0.0 g: 0.0 b: 0.9) underlineNormal: false underlineHover: true action: [closure] in ThreadPresenter3271994(ThreadPresenter)>>definitionForErrorReport...etc...
dragTracker: nil

BlockClosure>>cull:
Receiver: [closure] in Hyperlink18395(Hyperlink)>>doAction Arguments and temporary variables: firstArg: [closure] in ThreadPresenter3271994(ThreadPresenter)>>definitionForErrorReport...etc...
Receiver's instance variables:
outerContext: Hyperlink`18395(Hyperlink)>>doAction
startpc: 31
numArgs: 0

BlockClosure(ProtoObject)>>ifNotNil:
Receiver: [closure] in ThreadPresenter3271994(ThreadPresenter)>>definitionForErrorReport Arguments and temporary variables: ifNotNilBlock: [closure] in Hyperlink18395(Hyperlink)>>doAction
Receiver's instance variables:
outerContext: ThreadPresenter`3271994(ThreadPresenter)>>definitionForErrorReport...etc...
startpc: 71
numArgs: 0

Hyperlink18395(Hyperlink)>>doAction Receiver: Hyperlink18395#775106 in RowCell1084575#3906277 size: nil expansibility: 1 compressibility: ...etc... Arguments and temporary variables: <<error during printing> Receiver's instance variables: parent: Row742158#3019387 in ColumnCell1084575#4161172 size: nil expansibility: ...etc... agent: a HyperlinkMorphicAgent owner: nil visibleA: Attribute1278394#1004462 true
duct: Duct2701957#4127193 of: Hyperlink18395#775106 in RowCell1084575#390627...etc... area: RowCell1084575#3906277 size: nil expansibility: 1 compressibility: 1
boundsH: MappableHolder1278394#344753 13@0 corner: 937@15 updateLockLevel: 0 currentNaturalExtent: 77@15 textA: Attribute1278394#1943502 #'Error Report'
fontA: Attribute1278394#3404420 Font1278394#3599731
colorA: Attribute1278394#2049575 Color black hoverColorA: Attribute1278394#3596232 (Color r: 0.0 g: 0.0 b: 0.9)
downColorA: Attribute1278394#1962138 (Color r: 0.0 g: 0.0 b: 0.9) underlineNormal: false underlineHover: true action: [closure] in ThreadPresenter3271994(ThreadPresenter)>>definitionForErrorReport...etc...
dragTracker: nil

--- The full stack ---
NSMethodActivationMirror(Object)>>doesNotUnderstand: #errorReportOn:
[] in Debugging(Debugging)>>defaultErrorReportFor:
String class(SequenceableCollection class)>>new:streamContents:
String class(SequenceableCollection class)>>streamContents:
Debugging(Debugging)>>defaultErrorReportFor:
[] in Debugging(Debugging)>>initializerusingPlatform:ide: ThreadSubject3271994(ThreadSubject)>>errorReport
[] in ThreadPresenter3271994(ThreadPresenter)>>definitionForErrorReport [] in DisclosureComposer3332090(DisclosureComposer)>>privateExpand
UndefinedObject>>ifNil:
DisclosureComposer3332090(DisclosureComposer)>>privateExpand DisclosureComposer3332090(TwoStateComposer)>>expanded:
DisclosureComposer3332090(TwoStateComposer)>>toggle DisclosureComposer3332090(TwoStateComposerWithToggleIcon)>>userToggle
[] in ThreadPresenter3271994(ThreadPresenter)>>definitionForErrorReport [] in Hyperlink18395(Hyperlink)>>doAction
BlockClosure>>cull:
BlockClosure(ProtoObject)>>ifNotNil:
Hyperlink`18395(Hyperlink)>>doAction


HyperlinkMorphicAgent>>respondToMouseUpLeft
BrazilStringMorph>>mouseUp:
BrazilStringMorph(Morph)>>handleMouseUp:
MouseButtonEvent>>sentTo:
BrazilStringMorph(Morph)>>handleEvent:
BrazilStringMorph(Morph)>>handleFocusEvent:
MorphicEventDispatcher>>doHandlingForFocusEvent:with:
MorphicEventDispatcher>>dispatchFocusEvent:with:
BrazilStringMorph(Morph)>>processFocusEvent:using:
BrazilStringMorph(Morph)>>processFocusEvent:
[] in [] in [] in HandMorph>>sendFocusEvent:to:clear:
BlockClosure>>ensure:
MouseButtonEvent(MorphicEvent)>>becomeActiveDuring:
[] in [] in HandMorph>>sendFocusEvent:to:clear:
BlockClosure>>ensure:
HandMorph>>becomeActiveDuring:
[] in HandMorph>>sendFocusEvent:to:clear:
BlockClosure>>ensure:
PasteUpMorph>>becomeActiveDuring:
HandMorph>>sendFocusEvent:to:clear:
HandMorph>>sendEvent:focus:clear:
HandMorph>>sendMouseEvent:
HandMorph>>handleEvent:
HandMorph>>processEvents
[] in WorldState>>doOneCycleNowFor:
Array(SequenceableCollection)>>do:
WorldState>>handsDo:
WorldState>>doOneCycleNowFor:
WorldState>>doOneCycleFor:
PasteUpMorph>>doOneCycle
[] in MorphicProject>>spawnNewProcess
[] in BlockClosure>>newProcess


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