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See here for a response from CBECC-Com development team:

… the problem is related to a floating point precision problem in the source code that was associated with the 2016.2.1 release. Solution for this project in the 2016.2.1 release is to simply make a tiny adjustment to the Bldg:Az. I switched the Bldg:Az from 30 to 29.9 and the error disappears - modified project file attached….