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Unknown handle: Problem assigning default template data.

This error occurs when you have a local shading device assigned to a v5.9 model that has been upgraded to v6.0. 

Because it has a default template assigned anytime you make an edit in the building template manager it is trying to update the settings on the template assigned to the shading device. This error is pretty harmless and will not affect any of the settings you have already applied.
 
This issue was fixed in v6.0.1. You can upgrade to our most recent release by selecting Help > My User Area > Download Centre.