Unable to add a new livemark, existing livemarks not updated

[PRSoftware]

Versions
Add-on version: 3.8
Firefox version: 134.0
OS: Linux Mint 22

Describe the bug
First issue:
I click on the icon of the extension in the address bar on a web site offering RSS feed => the page of the extension opens.
When I click on the button "+ Add a bookmark" nothing is done and an error message appears after 15 seconds in the console window of the browser.
The error message is

Uncaught (in promise) Error: An unexpected error occurred
main moz-extension://7237eb6c-c2cc-4fd8-8011-99e8050fffbc/pages/subscribe/subscribe.js:73
AsyncFunctionThrow self-hosted:804

Other issue : existing livemarks were correctly updated until October 2, 2024 but new feeds are not read after this date.
On all the already existing livemarks folders, the last entry is not after October 2, 2024.

To Reproduce
Steps to reproduce the behavior:

1. Go to 'https://www.20minutes.fr/actus'
2. Click on the icon of the extension in the address bar
3. Click on the button "Add a bookmark" in the page of the extension
4. Wait for 15 seconds and see error in the console

Expected behavior
A new livemark must be added.

Extra context
None