Error on server side

[Hilaire Fernandes]

When populating a MagmaCollection I got error with index, because I used 
the wrong selector for the index. I fix that, then I start to get "class 
definition unknow" error message, then my whole data is unaccessible 
(lost), then from the server I stop and restrat (even restarting 
Squeak), and now each time I start the Magma server I got the two 
following messages (capture here).

I am sure I do a lot of mistake when using Magma, but now I start to get 
anxious with it.

Hilaire
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