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When attempting to import a LandXML file created from StormCAD V8i into AutoCAD Civil3D, the file does not import properly and the following error appears:
"A pipe or conduit had an unsupported geometry."[Problem ID#: 39352]
This seems to occur due to a known issue with AutoCAD Civil3D. Civil3D does not support a trapezoidal channel for import from an XML file. The conduit type will need to be changed in the StormCAD file to a supported geometry type. It can then be exported to an XML file and imported into Civil3D.
[Solution ID#: 500000065957]
Error importing a LandXML file "Specified method is not supported"
Error importing a LandXML file "Object reference not set to an instance of an object".