Replace your previous version of Squeak39.sources with the current one. 
I had similar problems as well (and wished that the different versions 
would have been called Squeak39a.sources, Squeak39b.sources etc. to 
avoid these issues).

Cheers,
   - Andreas

Noury Bouraqadi wrote:
> Hi,
> 
> I got some strange "Syntax Error" notifications (see the attached GIF) 
> when:
> -Evaluating "Object halt" or any other message that leads to an exception
> -When trying to look at failed tests in the SUnit test runner.
> 
> I had the problem in 7058, 7057 and 7056. But not in 7054.
> I looked at ParagraphEditor methods and found that method definitionss 
> are not always available. For the doIt method, I got
> doIt methodsFor: 'do-its' stamp: 'ab 3/23/2005 16:49'
> 
> When selecting other methods, I get again syntax error...
> 
> Is it just me ?
> 
> Noury
> 
> ------------------------------------------------------------------------
> 
> ------------------------------------------------------------------
> Dr. Noury Bouraqadi - Enseignant/Chercheur
> ARMINES - Ecole des Mines de Douai - Dept. I.A.
> http://csl.ensm-douai.fr/noury
> 
> European Smalltalk Users Group Board
> http://www.esug.org
> 
> Squeak: a Free Smalltalk
> http://www.squeak.org
> ------------------------------------------------------------------
> 
> 
> 
> ------------------------------------------------------------------------
> 
>