Topic on Help talk:TemplateStyles

I tryed to change my page "Template:Ahnentafel/styles.css" from "wikitext" to "sanitized_css" via "Spezial:ChangeContentModel". But now there is an text: [f45af79187c45d67cf8831aa] 2019-09-20 08:37:36: Fatal exception of type "Error"

What do I wrong? I installed and activated the Extensions CSS, TemplateStyles and Scribunto.

You should start by finding the error in your logs (look for that "f45af79187c45d67cf8831aa" identifier). If nothing else, you could then post it here (including the backtrace) so we can see what exactly the error was.