FilePathField not supported?

Hello,

I'm trying to call a FilePathField model into the FilePreference (I also tried BasePreference) class without success, here is my code in the dynamic_preferences_registry.py:

from django.db.models import FilePathField

@global_preferences_registry.register
class Search_Results_Directory(FilePreference):
	name = 'Search_Results_Directory'
	verbose_name = 'Search Results Directory'
	default = '../search-results/'
	required = True
	# Make it a folder
	field_class = FilePathField(path=default)

This is the error I get:

  File "/home/francois/Desktop/KiCad/kicad-part-manager/web-app/kicad_librarian/views.py", line 15, in SettingsURL
    form = global_preference_form_builder()
  File "/home/francois/.local/lib/python3.8/site-packages/dynamic_preferences/forms.py", line 126, in global_preference_form_builder
    return preference_form_builder(GlobalPreferenceForm, preferences, **kwargs)
  File "/home/francois/.local/lib/python3.8/site-packages/dynamic_preferences/forms.py", line 107, in preference_form_builder
    f = preference.field
  File "/home/francois/.local/lib/python3.8/site-packages/dynamic_preferences/types.py", line 76, in field
    return self.setup_field()
  File "/home/francois/.local/lib/python3.8/site-packages/dynamic_preferences/types.py", line 82, in setup_field
    return field_class(**field_kwargs)
TypeError: 'FilePathField' object is not callable

Is there a workaround? I would like the user to be able to select a directory, not a file.

Thank you, Francois