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 <iu136@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!



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