Rigorous Distillation

I am trying to simulate a rigorous column distillation for benzene-toluene mixture.But when i specify Reboiler specification as Compound Fraction in product stream (toluene = .985).I get the error that "Bubble Point method of Wang and Henke doesn't support the defined specifications. Please use the IO method for full specification support".

What I understand from this error is that I can't specify product composition for Rigorous column distillation and instead I have to specify bottom product molar flow or any other option for Reboiler. But in a video tutorial I have seen the instructor specifying product composition for Reboiler with Wang and Henke method and his simulation works.
Please if someone can clarify the meaning of error.
Thank you.
P.S- I am new to process simulation

DWSIM 12-01-18, 11:31 a.m. Divyansh_Raka
Can you please let us know which video tutorial are you referring to? The error basically means that there are some particular specifications which is supported by some particular method. So as to converge the results using that method, those specifications are only allowed.
19-01-18, 2:28 p.m. Priyam_Nayak

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