Working versions of FreeCad and Python in linux?

[KajWiik]

I have tried to install the macro in different versions of FreeCad but always got an error

19:34:25  Traceback (most recent call last):
  File "/home/kjwiik/.var/app/org.freecadweb.FreeCAD/data/FreeCAD/Macro/FreeCAD-OpenEMS-Export.FCMacro", line 27, in <module>
    dlgPanel = FOE_mod.ExportOpenEMSDialog()
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/kjwiik/.var/app/org.freecadweb.FreeCAD/data/FreeCAD/Macro/FreeCAD-OpenEMS-Export/ExportOpenEMSDialog.py", line 198, in __init__
    self.initLeftColumnTopLevelItems()
  File "/home/kjwiik/.var/app/org.freecadweb.FreeCAD/data/FreeCAD/Macro/FreeCAD-OpenEMS-Export/ExportOpenEMSDialog.py", line 1268, in initLeftColumnTopLevelItems
    items = self.cadHelpers.getOpenEMSObjects(filterStr)
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/kjwiik/.var/app/org.freecadweb.FreeCAD/data/FreeCAD/Macro/FreeCAD-OpenEMS-Export/utilsOpenEMS/GuiHelpers/CadInterface.py", line 66, in getOpenEMSObjects
    currentObjects = self.getObjects()
                     ^^^^^^^^^^^^^^^^^
  File "/home/kjwiik/.var/app/org.freecadweb.FreeCAD/data/FreeCAD/Macro/FreeCAD-OpenEMS-Export/utilsOpenEMS/GuiHelpers/FreeCADHelpers.py", line 91, in getObjects
    return FreeCAD.ActiveDocument.Objects
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
<class 'AttributeError'>: 'NoneType' object has no attribute 'Objects'

which looks like a Python version problem. Any suggestions?

[KajWiik]

Replying to myself: a rookie error. I did not create/open a design before running the macro! Now I get a window as I should.