plugin could not open file

[davidyannick]

I'm developping a plugin 

So i have a tree.json :

    {
        "env": [
            {
                "method":"replace",
                "TREE_EXPORTER_ROOT":
                {
                    "value":"/Users/david/Dropbox/Projets/Houdini/PythonTools/TreeExporter"
                },
                "HOUDINI_PATH":{
                    "method":"prepend",
                    "value":"$TREE_EXPORTER_ROOT"
                }
            }
        ]
    }

and

a MainMenuCommon.xml

 

<mainMenu>
    <menuBar>
        <subMenu>
            <label> ||  DYT Tools || </label> 
            <scriptItem>
                <label>
                    Load Tree
                </label>
                <scriptPath>
                    $TREE_EXPORTER_ROOT/scripts/truc.py
                </scriptPath>
            </scriptItem>
        </subMenu>
    </menuBar>
</mainMenu>

My folder structure :

 

But when I click on the menu item here is the eror : Could not open file : /Users/david/Dropbox/Houdini/PythonTools/TreeExproter/scripts/truc.py

 

Any idéa ?

Thanks