Heterogeneous Catalytic Error tf=t0

I want to carry out a heterogeneous catalytic reaction in a piston flow reactor, but when I calculate it I get: "error: tf = t0". I do not know if the failure is due to the configuration of the heterogeneous reactions or for other reasons.
I share a screenshot of the data that I have entered from the 3 reactions that take place.

DWSIM 01-07-20, 5:34 p.m. evapagan
Please share your simulation file at contact-dwsim@fossee.in for us to look into the issue.
03-07-20, 8:30 p.m. Priyam_Nayak

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