here insert explanation of what you were doing, suspect changes you've
made and so forth.

25 May 2010 1:03:21 pm

VM: unix - x86_64 - linux - Squeak3.10.2 of '5 June 2008' [latest
update: #7179]
Image: Pharo-1.0 [Latest update: #10517]

SecurityManager state:
Restricted: false
FileAccess: true
SocketAccess: true
Working Dir /var/www/seaside/register
Trusted Dir /var/www/seaside/register/secure
Untrusted Dir /var/www/seaside/register/My Squeak

UndefinedObject(Object)>>doesNotUnderstand: #binary
        Receiver: nil
        Arguments and temporary variables: 
                aMessage:       binary
                exception:      MessageNotUnderstood: receiver of "binary" is 
nil
                resumeValue:    nil
        Receiver's instance variables: 
nil

ReferenceStream(DataStream)>>setStream:
        Receiver: <<error during printing>>
        Arguments and temporary variables: 
                aStream:        nil
        Receiver's instance variables: 
                byteStream:     nil
                topCall:        nil
                basePos:        nil
                references:     nil
                objects:        nil
                currentReference:       nil
                fwdRefEnds:     nil
                blockers:       nil
                skipping:       nil
                insideASegment:         nil

ReferenceStream>>setStream:
        Receiver: <<error during printing>>
        Arguments and temporary variables: 
                aStream:        nil
        Receiver's instance variables: 
                byteStream:     nil
                topCall:        nil
                basePos:        nil
                references:     nil
                objects:        nil
                currentReference:       nil
                fwdRefEnds:     nil
                blockers:       nil
                skipping:       nil
                insideASegment:         nil

ReferenceStream class(DataStream class)>>on:
        Receiver: ReferenceStream
        Arguments and temporary variables: 
                aStream:        nil
        Receiver's instance variables: 
                superclass:     DataStream
                methodDict:     a MethodDictionary(#beginInstance:size:->a
CompiledMethod(117: Refe...etc...
                format:         150
                instanceVariables:      #('references' 'objects' 
'currentReference'
'fwdRefEnds' 'bl...etc...
                organization:   ('reading' beginReference: getCurrentReference
maybeBeginReferenc...etc...
                subclasses:     {SmartRefStream}
                name:   #ReferenceStream
                classPool:      a Dictionary(#RefTypes->an OrderedCollection(0 
0 0 0 1 1 1
1 1 0 1 0...etc...
                sharedPools:    nil
                environment:    Smalltalk
                category:       #'System-Object Storage'
                traitComposition:       nil
                localSelectors:         nil

ReferenceStream class>>on:
        Receiver: ReferenceStream
        Arguments and temporary variables: 
                aStream:        nil
        Receiver's instance variables: 
                superclass:     DataStream
                methodDict:     a MethodDictionary(#beginInstance:size:->a
CompiledMethod(117: Refe...etc...
                format:         150
                instanceVariables:      #('references' 'objects' 
'currentReference'
'fwdRefEnds' 'bl...etc...
                organization:   ('reading' beginReference: getCurrentReference
maybeBeginReferenc...etc...
                subclasses:     {SmartRefStream}
                name:   #ReferenceStream
                classPool:      a Dictionary(#RefTypes->an OrderedCollection(0 
0 0 0 1 1 1
1 1 0 1 0...etc...
                sharedPools:    nil
                environment:    Smalltalk
                category:       #'System-Object Storage'
                traitComposition:       nil
                localSelectors:         nil

ReferenceStream class(DataStream class)>>newFileNamed:
        Receiver: ReferenceStream
        Arguments and temporary variables: 
                aString: 
'/var/www/seaside/register/PatagoniaBackup/register/esug2010.1'
                strm:   nil
        Receiver's instance variables: 
                superclass:     DataStream
                methodDict:     a MethodDictionary(#beginInstance:size:->a
CompiledMethod(117: Refe...etc...
                format:         150
                instanceVariables:      #('references' 'objects' 
'currentReference'
'fwdRefEnds' 'bl...etc...
                organization:   ('reading' beginReference: getCurrentReference
maybeBeginReferenc...etc...
                subclasses:     {SmartRefStream}
                name:   #ReferenceStream
                classPool:      a Dictionary(#RefTypes->an OrderedCollection(0 
0 0 0 1 1 1
1 1 0 1 0...etc...
                sharedPools:    nil
                environment:    Smalltalk
                category:       #'System-Object Storage'
                traitComposition:       nil
                localSelectors:         nil

ReferenceStream class>>newFileNamed:do:
        Receiver: ReferenceStream
        Arguments and temporary variables: 
                aName: 
'/var/www/seaside/register/PatagoniaBackup/register/esug2010.1'
                aBlock:         [closure] in [] in 
PatPatagoniaFileDatabase>>saveRepository
                file:   nil
        Receiver's instance variables: 
                superclass:     DataStream
                methodDict:     a MethodDictionary(#beginInstance:size:->a
CompiledMethod(117: Refe...etc...
                format:         150
                instanceVariables:      #('references' 'objects' 
'currentReference'
'fwdRefEnds' 'bl...etc...
                organization:   ('reading' beginReference: getCurrentReference
maybeBeginReferenc...etc...
                subclasses:     {SmartRefStream}
                name:   #ReferenceStream
                classPool:      a Dictionary(#RefTypes->an OrderedCollection(0 
0 0 0 1 1 1
1 1 0 1 0...etc...
                sharedPools:    nil
                environment:    Smalltalk
                category:       #'System-Object Storage'
                traitComposition:       nil
                localSelectors:         nil

[] in PatPatagoniaFileDatabase>>saveRepository
        Receiver: a PatPatagoniaFileDatabase
        Arguments and temporary variables: 
                fileName: 
'/var/www/seaside/register/PatagoniaBackup/register/esug2010.1'
        Receiver's instance variables: 
                conference:     a PatConference
                entryPoint:     'register/esug2010'
                lock:   a Semaphore(a Process in [] in Semaphore>>critical: a 
Process
in [] in Se...etc...

[] in Semaphore>>critical:
        Receiver: a Semaphore(a Process in [] in Semaphore>>critical: a Process
in [] in Semaphore>>critical...etc...
        Arguments and temporary variables: 
<<error during printing>
        Receiver's instance variables: 
                firstLink:      a Process in [] in Semaphore>>critical:
                lastLink:       a Process in [] in Semaphore>>critical:
                excessSignals:  0

BlockClosure>>ensure:
        Receiver: [closure] in Semaphore>>critical:
        Arguments and temporary variables: 
                aBlock:         [closure] in Semaphore>>critical:
                returnValue:    nil
                b:      nil
        Receiver's instance variables: 
                outerContext:   Semaphore>>critical:
                startpc:        38
                numArgs:        0

Semaphore>>critical:
        Receiver: a Semaphore(a Process in [] in Semaphore>>critical: a Process
in [] in Semaphore>>critical...etc...
        Arguments and temporary variables: 
<<error during printing>
        Receiver's instance variables: 
                firstLink:      a Process in [] in Semaphore>>critical:
                lastLink:       a Process in [] in Semaphore>>critical:
                excessSignals:  0

PatPatagoniaFileDatabase>>saveRepository
        Receiver: a PatPatagoniaFileDatabase
        Arguments and temporary variables: 

        Receiver's instance variables: 
                conference:     a PatConference
                entryPoint:     'register/esug2010'
                lock:   a Semaphore(a Process in [] in Semaphore>>critical: a 
Process
in [] in Se...etc...

[] in PatPatagoniaFileDatabase>>takeSnapshot
        Receiver: a PatPatagoniaFileDatabase
        Arguments and temporary variables: 

        Receiver's instance variables: 
                conference:     a PatConference
                entryPoint:     'register/esug2010'
                lock:   a Semaphore(a Process in [] in Semaphore>>critical: a 
Process
in [] in Se...etc...

[] in BlockClosure>>newProcess
        Receiver: [closure] in PatPatagoniaFileDatabase>>takeSnapshot
        Arguments and temporary variables: 

        Receiver's instance variables: 
                outerContext:   PatPatagoniaFileDatabase>>takeSnapshot
                startpc:        45
                numArgs:        0


--- The full stack ---
UndefinedObject(Object)>>doesNotUnderstand: #binary
ReferenceStream(DataStream)>>setStream:
ReferenceStream>>setStream:
ReferenceStream class(DataStream class)>>on:
ReferenceStream class>>on:
ReferenceStream class(DataStream class)>>newFileNamed:
ReferenceStream class>>newFileNamed:do:
[] in PatPatagoniaFileDatabase>>saveRepository
[] in Semaphore>>critical:
BlockClosure>>ensure:
Semaphore>>critical:
PatPatagoniaFileDatabase>>saveRepository
[] in PatPatagoniaFileDatabase>>takeSnapshot
[] in BlockClosure>>newProcess

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