Add New Form: Editor error

[robin148]

After installing Formality on my WordPress 6.6.1 working on local with XAMPP I tried to add my first new form and I have this message:

Error message:
TypeError: Cannot read properties of null (reading 'classList')
at onSelect (http://localhost/tssr/wp-content/plugins/formality/dist/scripts/formality-editor.js?ver=1.5.7:1:60150)
at setSelectedId (http://localhost/tssr/wp-includes/js/dist/components.min.js?ver=36b97398bf090476214e:41:5034)
at http://localhost/tssr/wp-includes/js/dist/components.min.js?ver=36b97398bf090476214e:27:26350
at m (http://localhost/tssr/wp-includes/js/dist/components.min.js?ver=36b97398bf090476214e:27:24535)
at http://localhost/tssr/wp-includes/js/dist/components.min.js?ver=36b97398bf090476214e:27:24560
at Set.forEach ()
at Object.f [as setState] (http://localhost/tssr/wp-includes/js/dist/components.min.js?ver=36b97398bf090476214e:27:24547)
at http://localhost/tssr/wp-includes/js/dist/components.min.js?ver=36b97398bf090476214e:41:5152
at http://localhost/tssr/wp-includes/js/dist/components.min.js?ver=36b97398bf090476214e:41:5459
at ri (http://localhost/tssr/wp-includes/js/dist/vendor/react-dom.min.js?ver=18.3.1:2:93198)