I try to export in HECRAS a model 2D with only three layers: DTM, flowarea2d and 2Dbreaklines.
I receive an error message at line 137 of code "ras_gis_import.py":
137, in spatial_extent box_min = box[box.index('(')+1:box.index(',')].split()
AttributeError: 'NoneType' object has no attribute 'index'