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error: 9999999 the field is not nullable

Question asked by altair1981 on Jun 4, 2014
Latest reply on Jun 5, 2014 by altair1981
Hello everyone,

I have this python stand alone script wich is runing fine until gets to this part.

if gp.Exists(lcp_name+".shp") == 0:         gp.CostPath_sa("samp_lyr", cd_name, bl_name, "cost_path", "BEST_SINGLE", "")          # Export the cost of the LCP         vat = gp.searchcursor("cost_path")         row_n =         cost1_list = []         while row_n:             cost1_list.append(row_n.pathcost)             row_n =         cost1 = sum(cost1_list)         del vat, row_n, cost1_list          # Turns the raster LCP to a polyline         gp.RasterToPolyline_conversion("cost_path","temp.shp", "ZERO", "", "SIMPLIFY")         gp.Dissolve_management("temp.shp", lcp_name+".shp")         gp.delete_management("temp.shp")         gp.delete_management("cost_path")          # Calculate the length of the LCP.         gp.Addfield_management(lcp_name+".shp", "LENGTH", "DOUBLE")         gp.CalculateField_management(lcp_name+".shp", "LENGTH", "float(!SHAPE.LENGTH!)", "PYTHON")         gp.Addfield_management(lcp_name+".shp", "COST", "DOUBLE")         gp.CalculateField_management(lcp_name+".shp", "COST", cost1, "PYTHON")

The error I get is: arcgisscripting.ExecuteError: Error 9999999: Error executing function. The field is not nullable. [COST]. Failed to execute <Calculate field>

It creates the field "cost" but doesn't fill it. In ArcMap I open the shape and I'm able to fill it with zero value so I don't understand the error. 
Any suggestions??

Thanks a lot