2009/12/22 Andreas Raab <andreas.raab at gmx.de>:
> Does anyone else see this? It's a weird problem since the update in question
> only removes code and as a consequence there shouldn't be any attempt to
> create new compiled method trailers during installation. Have you by any
> chance some other package installed that hooks into SystemChangeNotifier and
> does strange things upon method removal?
>
it is because of triggering system notification, and then Changeset
tries to get sourcePointer of method being removed and as result its
going to create a trailer instance.

>
> Cheers,
>  - Andreas
>
> Randal L. Schwartz wrote:
>>
>> MessageNotUnderstood: CompiledMethodTrailer class>>trailerClass
>> 22 December 2009 8:09:25.698 am
>>
>> VM: Mac OS - a SmalltalkImage
>> Image: Squeak3.10.2 [latest update: #8507]
>>
>> SecurityManager state:
>> Restricted: false
>> FileAccess: true
>> SocketAccess: true
>> Working Dir /Users/merlyn/Smalltalk/Squeak3.0/Squeak3.10.2-Trunk-090912
>> Trusted Dir /foobar/tooBar/forSqueak/bogus
>> Untrusted Dir /Users/merlyn/Library/Preferences/Squeak/Internet/My Squeak
>>
>> CompiledMethodTrailer class(Object)>>doesNotUnderstand: #trailerClass
>>                      Receiver: CompiledMethodTrailer
>>                      Arguments and temporary variables: <<error during
>> printing>
>>        Receiver's instance variables:                   superclass:
>>   Object
>>                                       methodDict:      a
>> MethodDictionary(#clear->(CompiledMethodTrailer>>#clear "a Compil...etc...
>>                                                        format:
>>                                       140
>>
>>                                        instanceVariables:  #('data'
>> 'encodedData' 'kind' 'size' 'method')
>>
>>                                                            organization:
>>      ('initialize-release' clear initialize method:)
>> ('creating a meth...etc...
>>             subclasses:        nil
>>                                name:   #CompiledMethodTrailer
>>                                        classPool:      a Dictionary()
>>                                                        sharedPools:    nil
>>
>>  environment:    Smalltalk "a SystemDictionary with lots of globals"
>>
>>              category:    #'Kernel-Methods'
>>
>>                           traitComposition:  nil
>>
>>                                              localSelectors:  nil
>>
>> CompiledMethodTrailer class>>new
>>                      Receiver: CompiledMethodTrailer
>>                      Arguments and temporary variables: <<error during
>> printing>
>>        Receiver's instance variables:                   superclass:
>>   Object
>>                                       methodDict:      a
>> MethodDictionary(#clear->(CompiledMethodTrailer>>#clear "a Compil...etc...
>>                                                        format:
>>                                       140
>>
>>                                        instanceVariables:  #('data'
>> 'encodedData' 'kind' 'size' 'method')
>>
>>                                                            organization:
>>      ('initialize-release' clear initialize method:)
>> ('creating a meth...etc...
>>             subclasses:        nil
>>                                name:   #CompiledMethodTrailer
>>                                        classPool:      a Dictionary()
>>                                                        sharedPools:    nil
>>
>>  environment:    Smalltalk "a SystemDictionary with lots of globals"
>>
>>              category:    #'Kernel-Methods'
>>
>>                           traitComposition:  nil
>>
>>                                              localSelectors:  nil
>>
>> CompiledMethod>>trailer
>>        Receiver: (CompiledMethodTrailer class>>#trailerClass "a
>> CompiledMethod(3360)")
>>        Arguments and temporary variables: <<error during printing>
>>        Receiver's instance variables: (CompiledMethodTrailer
>> class>>#trailerClass "a CompiledMethod(3360)")
>> CompiledMethod>>sourcePointer
>>        Receiver: (CompiledMethodTrailer class>>#trailerClass "a
>> CompiledMethod(3360)")
>>        Arguments and temporary variables: <<error during printing>
>>        Receiver's instance variables: (CompiledMethodTrailer
>> class>>#trailerClass "a CompiledMethod(3360)")
>>
>>
>
>
>



-- 
Best regards,
Igor Stasenko AKA sig.