Regarding the implementation of viscosity and density from the flowsheet

[nihal]

I was trying to extract the viscosity and density from the flowsheet using the code v=obj.GetPhase('perhydrodibenzyltoulene').Properties.viscosity where the value v is used in other equations but it shows the error as
TypeError: unsupported operand type(s) for -: 'float' and 'NoneType' while executing the program
Can some one help in this regard

[Daniel Medeiros]

"perhydrodibenzyltoulene" isn't a phase, nihal. You must pay more attention to what you're doing.

https://dwsim.inforside.com.br/api_help60/html/T_DWSIM_Thermodynamics_Streams_MaterialStream.htm

[nihal]

Sorry Sir, that was a mistake from my part that I wanted to write phase for the selected phase , even though i wrote the phase v=obj.GetPhase('Overall').Properties.viscosity . I am still getting the same error