I encountered an issue and I thought I share the solution. Maybe most of you already know.
Root cause: Config XML got stuck in Check Out state. Like a normal document in a document library.
Go to Solution.
If I manually Check In the XML and try to open from teh editor, I can reproduce the issue. It works.
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Thanks for the tip, this helped me too. I got the below error and used your method to check in the file and it resolved the issue.
Thanks for this, saved my rear today!!
(y) Feels good to hear it was helpful even after 3 years...