Angle planes issue

Operating system: Win 10
Slicer version: 4.10.2
Expected behavior: Angles measurements
Actual behavior: Impossible to create a new plane

Python error line
Traceback (most recent call last):
File “C:/Users/Malick/AppData/Roaming/NA-MIC/Extensions-28257/AnglePlanesExtension/lib/Slicer-4.10/qt-scripted-modules/AnglePlanes.py”, line 244, in onLandmarksChanged
onSurface)
File “C:/Users/Malick/AppData/Roaming/NA-MIC/Extensions-28257/AnglePlanesExtension/lib/Slicer-4.10/qt-scripted-modules/AnglePlanes.py”, line 999, in connectLandmarks
PointAddedEventTag = landmarks.AddObserver(landmarks.PointAddedEvent, self.onPointAddedEvent)
AttributeError: ‘vtkSlicerMarkupsModuleMRMLPython.vtkMRMLMarkupsFid’ object has no attribute ‘PointAddedEvent’

Planes are incorporated into the Markups module. You will be better of using the latest preview.

Sorry, I am still stuck
I create markups
I’d like to connect them to create a new plane

Did you switch to Markups-> Plane setting:

You can find more details about the Markups module, including how to interactively change planes, here:

No such option
I use the 4.10.2 version
I’ll upgrade

Great
Planes created
Final query please: how to calculate angles between planes (created ones and standard ones)