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Last Tested: Jan 21, 2019
TL/DR: check for include: *.dashboard in other model files.
This error can pop up from normal Unknown Field reasons so check those too (missing join, fields: [], etc)
The issue is that the dashboard is included in a model that doesn't contain the necessary joins. Usually you have an include: *.dashboard parameter in another model than the dashboard is usually referring to.
You'll either want to comment out the include: or replace the *.dashboard with specific dashboard names.
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