I updated everything but unfortunately I can't change the structure of the wall.
Freecad shows me the following error:
Traceback (most recent call last):
File "C:\Users\USER\AppData\Roaming\FreeCAD\Mod\FreeCAD_SketchArch\SketchArchCommands.py", line 52, in addSelection
self.proceed(doc, obj, sub, pnt)
File "C:\Users\USER\AppData\Roaming\FreeCAD\Mod\FreeCAD_SketchArch\ArchSketchObject.py", line 1182, in proceed
slabEdgesList = self.targetStructure.ArchSketchEdges
<class 'AttributeError'>: 'NoneType' object has no attribute 'ArchSketchEdges'