I'm trying to automate the conversion of raster to polygon and the raster files are in "TIF" format which is a "floating point". I copy the code below from this <a href="https://gis.stackexchange.com/questions/108655/raster-to-polygon-conversion">link</a> so it needs some changes because of "unsigned integer" and ...that I don't know. how can I correct this code? I'm getting an error while executing it. Could you have some suggestions, please? > Runtime error Traceback (most recent call last): File "<string>", > line 18, in <module> TypeError: 'NoneType' object is not iterable > Code `import arcpy, os ... from arcpy import env ... from arcpy.sa import * ... ... #To overwrite output ... arcpy.env.overwriteOutput = True ... ... #Set environment settings ... env.workspace = "K:\1400-10-20" ... ... outws="K:\1400-10-20\m" ... ... #checkout ArcGIS spatial analyst extension license ... arcpy.CheckOutExtension("Spatial") ... ... inraster = arcpy.ListRasters("*", "TIF") ... ... for i in inraster: ... filename=os.path.splitext(i)[0] ... outPolygons= outws + str(filename) + '.shape' ... field = "VALUE" ... arcpy.RasterToPolygon_conversion(i, outPolygons, "NO_SIMPLIFY", field)