How can I unblock this?
I'm afraid you need to look at the application log (It should be <confluence home>/logs/atlassian-confluence.log ) to see what the underlying error is. Do you have access to that?
I don't currently, but I could dig it up. At a cursory glance, what could be a good guess for this error's cause?
Almost any system error that might cause the back-end to be slow or disconnect during an operation. I'm afraid the error you see here could be used for almost any back-end error, we really do need to look at the logs!
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