inaccessible web interface

[Extension98]

Hello,
I am experiencing a problem with my rsyslog/loganalyzer server. After an installation which went well yesterday afternoon, the server was functional and recovered the logs sent to it. I would like to point out that it collects logs from a firewall which manages around 50 servers, so there is a significant quantity of logs.
Since yesterday evening, it is no longer accessible and I have the following error messages on the web interface. Apparently this is a fairly well-known problem, but none of the proposed solutions worked for me.
If anyone has encountered this problem before and managed to find a solution, I'm interested.

Tnak you