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I get an error message - Floating Point Error in PANEPR, what is this and how can I avoid it?

This error (now checked for in version 5.4.1) is caused by inappropriate parameters for glazing panes, such as transmittance = 0 or reflectance = 0. Please check your values. If you can't see the problem, send in the model to support@iesve.com and we will have a look. 

For further guidance on matching manufacturers' glazing data please refer to the Constructions Database User Guide.