[Koha] Critical error on Koha website

[Michael Kuhn]

Hi

When I'm trying to preview or release the current Koha newsletter I'm 
getting the following message:

There has been a critical error on this website.

I'm also getting this message when I try to access older newsletters, 
for example

* https://koha-community.org/koha-community-newsletter-april-2022/
* https://koha-community.org/koha-community-newsletter-august-2022/

Can someone with the necessary rights and knowledge please remove this 
problem?

Best wishes: Michael
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