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Developing a module with Tryton 4.6.0

I can' t manage to make a simple tree view appear

Here's the relevant code. What's wrong with it ?

And here's a picture

Cœur
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user1632812
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  • I see the "Processing" widget is visible. Often it means there was an exception when processing a request. You just take a look at the javascript console. – ced Dec 13 '17 at 08:26
  • in the concole I see some javascript resource can' t be reached: Unchecked lastError value: Error: Could not establish connection. Receiving end does not exist. ExtensionCommon.jsm:407 – user1632812 Dec 14 '17 at 08:14
  • did I mess up the SAO installation ? How ? – user1632812 Dec 14 '17 at 15:25
  • anyway, this happens on the other menus too. Only mine is unable to show a view – user1632812 Dec 14 '17 at 15:29

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