That error is thrown on the page whenever there is an error server-side that it doesn’t know how to handle.
If you check the server error logs from around the time the above was shown can you see any errors from Event Espresso?
Your host will usually have a section on your control panel to view server errors.
The support post ‘Error message when downloading Event Registrants CSV report’ is closed to new replies.
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Support forum for Event Espresso 3 and Event Espresso 4.