001557: Invalid rule package.
Description
The rule package is either invalid or corrupted.
Solution
Review the contents of your rule package for inconsistencies.
Re-create the rule package using ArcGIS CityEngine or try downloading it again.
The rule package is either invalid or corrupted.
Review the contents of your rule package for inconsistencies.
Re-create the rule package using ArcGIS CityEngine or try downloading it again.