better error message
better error message

SIGISLV/arcpy-cpp-interop,SIGISLV/arcpy-cpp-interop,SIGISLV/arcpy-cpp-interop,ghisprince/arcpy-cpp-interop,ghisprince/arcpy-cpp-interop,scw/arcpy-cpp-interop,scw/arcpy-cpp-interop,scw/arcpy-cpp-interop,ghisprince/arcpy-cpp-interop