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BEOPT Cannot Save File

I cannot run BEopt (It appears) because the software cannot initialize the file, cannot set the reference building, so cannot move forward. How can I fix this?

I get the following:

Object reference not set to an instance of an object. Stack Trace: at NREL.BEopt.ObjLibCS.BEoptDesign.SelectBenchmarkOption(String date) at NREL.BEopt.ObjLibCS.BEoptCase.set_ReferenceBuilding(RefBldg value) at NREL.BEopt.BEoptUIVB.CaseInputToolStrip.set_ReferenceBuilding(RefBldg value) at NREL.BEopt.BEoptUIVB.CaseInputToolStrip.tsRefBldg_SelectedIndexChanged(Object sender, EventArgs e)

BEOPT Cannot Save File

I cannot run BEopt (It appears) because the software cannot initialize the file, cannot set the reference building, so cannot move forward. How can I fix this?

I get the following:

Object reference not set to an instance of an object. Stack Trace: at NREL.BEopt.ObjLibCS.BEoptDesign.SelectBenchmarkOption(String date) at NREL.BEopt.ObjLibCS.BEoptCase.set_ReferenceBuilding(RefBldg value) at NREL.BEopt.BEoptUIVB.CaseInputToolStrip.set_ReferenceBuilding(RefBldg value) at NREL.BEopt.BEoptUIVB.CaseInputToolStrip.tsRefBldg_SelectedIndexChanged(Object sender, EventArgs e)