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Last tested: Mar 31, 2020
Pre 7.2: if a query fails to run for any reason (a DB error, a problem with table calc syntax, etc.), the cache will not be set but the invalid cache entry will still be retrieved, throwing an
Error streaming dashboard-my_dashboard/my_tile.csv to out error.
Version 7.2+: Thanks to the amazing Ryan Dunlavy, the underlying query error is now reported when scheduling zips of dashboards, so the workaround here is to send a test of a schedule of the zip to see the query error. From there you can find the tile with the error to fix.
Version 7.18+: The underlying query error is now also surfaced when downloading zips of dashboards.
However, even now that the underlying query error is surfaced, these error messages can still be difficult to interpret:
You can Explore from Here on the dashboard tile named in the error message to see what is causing the download to fail. Possible causes: missing values were not filled, error in table calc formula, etc.