The error message indicates that you are using a window construction that is incompatible with how DOE-2.2 (the simulation engine used by GBS) simulates windows. Is this a window construction you created yourself? Or one from the Revit library?
Try to simulate the model again without specifying the window (GBS will automatically apply properties to your windows, based upon ASHRAE baseline requirements for your project location).
Regards,
Marjorie Stein
QA Analyst
Generative Design Group
Autodesk, Inc. insight.support@autodesk.com