Question-and-Answer Resource for the Building Energy Modeling Community
 | 1 | initial version |
The error you are seeing is occuring prior to evaluation of CHECK rules, to be specific, it is in the DEFAULT rules that are evaluated each time the project is opened (actually 3x during file open to ensure properties dependent on each other are fully defined) and each time a property in the model is changed.
In any case, the root cause in your case is there are two ThermalZones, "Zn FC-3-0.2" and "Zn FC-4-0.3", which are included in the model but are not referenced by any Spaces. If you delete these zones (and the systems defined to serve them), this error will go away.
This issue does warrant a rule update to mitigate this error from being logged until running the analysis, so I appreciate you bringing it to our attention. In the future, 'Undefined data' errors are best handled through the CBECC-Com website: http://bees.archenergy.com/issue.html
