Hi, 

You are missing to initialise the Voyage repository. 
I don’t know how is explained in the Mooc, but you will probably need to do 
something like: 

VOMemoryRepository new enableSingleton.

Cheers,
Esteban

> On 22 Nov 2018, at 17:51, iu136 via Pharo-users <pharo-users@lists.pharo.org> 
> wrote:
> 
> 
> From: iu136 <iu...@yahoo.com>
> Subject: can't debug TinyBlog in the Pharo MOOC
> Date: 22 November 2018 at 17:51:12 CET
> To: pharo-users@lists.pharo.org
> 
> 
> hi guys
> I'm following the Pharo MOOC and I'm at Week 4. the other day, I was trying
> to implement TinyBlog: Data Persistency using Voyage and Mongo, when I tried
> to compile the code, I've got an Error. the title of Error says:
> "MessageNotUnderstood: receiver of "save:" is nil", and it refers to
> TBMBlog>>writeBlogPost.
> 
> TBMBlog>>writeBlogPost: aTBMPost
>    posts add: aTBMPost.
>    aTBMPost save.
>    self save .
> 
> thanks for your answers!
> 
> 
> 
> --
> Sent from: http://forum.world.st/Pharo-Smalltalk-Users-f1310670.html
> 
> 
> 

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