Receiving Error Message When Converting XML Feature Definitions File to XLSX

I exported the feature definitions from the new OpenRoads CE version 2 file titled "Survey_Features_Annotations_Levels_Elem Temp Imperial.dgnlib to preform some bulk editing but when I tried to convert it to an xlsx format using the features_importexport_excel.exe tool I receive an error message that reads "Error exporting features to Excel: Object reference not set to instance of an object.". 

What does this error message mean and how can I move past it?

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