missing error messages when importing folder

[amazy]

On My dev PC, I tried running this command and do not get any feedback although nothing happens

PS C:\Users\Alain> python -m orthanc_tools.orthanc_folder_importer --folder="C:\\Orthanc" --url=http://localhost:8044 --user=orthanc --password=orthanc
C:\Program Files\Python38\lib\runpy.py:127: RuntimeWarning: 'orthanc_tools.orthanc_folder_importer' found in sys.modules after import of package 'orthanc_tools', but prior to execution of 'orthanc_tools.orthanc_folder_importer'; this may result in unpredictable behaviour
  warn(RuntimeWarning(msg))

Tested with v 0.8.9.
And an Orthanc has been started with this command:

docker run -p 8044:8042 osimis/orthanc