Style Edit error

Hello,
I wanted to make a style for Historical Encounters.Basically, they use APA7, so I started the reference style editor, and "saved" that style into a *csl-file first (Historical Encounters APA7.csl), which I then reloaded, hoping to be able to edit it afterwards.

On adding the new (unchanged) style, I got an error, however, and now alls APA styles are gone, too.I can't even find them in the list, and re-installing them from the repository also yields an error.
What to do?

Thanks in advance
A
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