[Moose-dev] Moose 7 Model Description

Hi guys, In Moose 7/Pharo 7, I have this message : "Moose description are not initialized. Have you refreshed the meta-model? (e.g., MooseModel resetMeta)". I am working on my own model created in Moose6.1. It worked with it. Browsing the model in the MoosePanel is possible with the use of pragmas MSEProperties. But it seems that in Moose 7, there are changes. Can someone help me or give me a documentation about what was changed in Moose 7 in the declaration on models ? Thank you