Error creating textual references to dropped morphs

> I am a Smalltalk newb, so please forgive me if this isn't the right
> place to go with this.  I was following a guide that had me open a
> workspace, set "Create textual references to dropped morphs", and
> then drag in a morph from the Workspace.  It worked great for me on
> one machine, which had an older version of Squeak.
>
> But on my Mac, I just installed Squeak 5.1 and when I tried this, I
> got an error about 'nil' not responding to the "isOctetString"
> message.  As I said, I'm a baby smalltalker, but I looked at the
> older versions of the "acceptDroppingMorph" method on the Workspace
> class.  I found that if I changed the section that reads as follows:
>
>         (dropee isKindOf: TransferMorph)
>                 ifTrue: [reference := dropee passenger.
>                         externalName := dropee passenger className]
>                 ifFalse: [reference := dropee.
>                         dropee externalName].
>
> It looked to me like the "ifFalse" branch fails to set the
> externalName variable, which makes it nil later on.  I changed it to
> read as follows, and it seems to work fine for me now:
>
>         (dropee isKindOf: TransferMorph)
>                 ifTrue: [reference := dropee passenger.
>                         externalName := dropee passenger className]
>                 ifFalse: [reference := dropee.
>                         externalName := dropee externalName].
>
> As I said, I'm new to the Squeak world, so I'm not sure where or how
> to send this in to the right place, so please correct me if I should
> be sending this somewhere else.
>
> Thanks!
>
> Yakov
>
>
>
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>