Node Red startup problem

I’ve tried to install Node Red as described here : https://www.wundertech.net/how-to-set-up-node-red-on-home-assistant/

Everything is set up, but when click in the left bar on “Node-RED”, I get a pop up mentioning “The add-on is not running. Do you want to start it now?”. I choose “Start Add-on”, and after some seconds (between 10 and 15 seconds), the same message appears.

I tried to look into the logs (logbook), but nothing is mentioned there.

Look in the logs under the addon “Settings > Addons > Node Red”. You should see something like this:

-----------------------------------------------------------
 Add-on: Node-RED
 Flow-based programming for the Internet of Things
-----------------------------------------------------------
 Add-on version: 14.6.1
 There is an update available for this add-on!
 Latest add-on version: 14.6.3
 Please consider upgrading as soon as possible.
 System: Home Assistant OS 11.0  (amd64 / qemux86-64)
 Home Assistant Core: 2023.10.3
 Home Assistant Supervisor: 2023.10.1
-----------------------------------------------------------
 Please, share the above information when looking for help
 or support in, e.g., GitHub, forums or the Discord chat.
-----------------------------------------------------------
s6-rc: info: service base-addon-banner successfully started
s6-rc: info: service fix-attrs: starting
s6-rc: info: service base-addon-log-level: starting
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