Gestion app is not working

[Thatoo]

Here is the upstream issue I opened but maybe it is linked to Yunohost : https://github.com/baimard/gestion/issues/360

After installing the "Gestion" app that I used on an other nextcloud (not managed by Yunohost), when I reach the app page, I'm welcomed with 3 error "[object Object]". I can't choose the folder where to save. If I go to apps/gestion/config, I'm welcomed also with [object Object] object and everything is "loading". In the console of the web browser, it says :

XHR PROPFIND https://mynextcloud.fr/nuage-nextcloud/apps/gestion/getStats [HTTP/2 405 Method Not Allowed 76ms]

XHR PROPFIND https://mynextcloud.fr/nuage-nextcloud/apps/gestion/getConfiguration [HTTP/2 405 Method Not Allowed 74ms]

XHR PROPFIND https://mynextcloud.fr/nuage-nextcloud/apps/gestion/getConfiguration [HTTP/2 405 Method Not Allowed 156ms]

XHR PROPFIND https://mynextcloud.fr/nuage-nextcloud/apps/gestion/getClients [HTTP/2 405 Method Not Allowed 83ms]

Uncaught ReferenceError: showError is not defined onload https://mynextcloud.fr/nuage-nextcloud/apps/gestion/js/client.app.js?v=5aeb03f3-0:2 loadClientDT https://mynextcloud.fr/nuage-nextcloud/apps/gestion/js/client.app.js?v=5aeb03f3-0:2 https://mynextcloud.fr/nuage-nextcloud/apps/gestion/js/client.app.js?v=5aeb03f3-0:2 EventListener.handleEvent* https://leprette.fr/nuage-nextcloud/apps/gestion/js/client.app.js?v=5aeb03f3-0:2 https://mynextcloud.fr/nuage-nextcloud/apps/gestion/js/client.app.js?v=5aeb03f3-0:2 https://mynextcloud.fr/nuage-nextcloud/apps/gestion/js/client.app.js?v=5aeb03f3-0:2

Screenshots

[Thatoo]

A javascript issue apparently but the problem occurs in both Firefox and Chromium even on private navigation (without any web browser extension).