Can you give me (super) admin and (s)ftp access so I can take a look?
And tell me on what url I can see/reproduce the issue.
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I went to the 'Extensions > Manage > Manage' page and saw that the Regular Labs Library was not installed correctly. It was there, but just showing the language string.
So I uninstalled the RL Library plugin and library extensions.
Re-installed the latest version of Advanced Module Manager...
And all working fine now.
PS: Nice to see that website using my extensions... I was born in Zaandam and my mom has worked for De Bieb in the past 🙂
There has been a change in the Regular Labs Library.
And due to something weird in the Joomla installation process, things can go haywire halfway, causing an extension (in this case the Regular Labs Library) to not be able to update all the files.
Then that causes the error for the new extensions containing code that relies on those new updated files.
This pretty much only happens when there are new files that need to be created and for some reason fail. So this should not happen often at all. I just had to add new files and change some stuff around in preparation for Joomla 4 compatibility.
And unfortunately, this seems to break bad when Joomla has a hiccup during the extension update process.