Aspen EDR calculates evaporator problems

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When using Aspen EDR to calculate the evaporator (AKU mechanism), the following message appears: “You have specified the shell-side stream as single-phase.” However, this heat exchanger is a kettle-type heat exchanger. Please correct your input. ” You have specified that the shellside stream is single-phase. However, the exchanger is of the kettle type. Please correct your input. Process description: The tube side contains saturated steam, while the shell side contains fuming sulfuric acid. The saturated steam in the tubes heats 35% fuming sulfuric acid liquid on the shell side; as a result, some SO3 gas is generated, and the concentration of fuming sulfuric acid drops to 25%. This is what the system indicates, but the fuming sulfuric acid enters the shell side as a single-phase liquid. How can this issue be resolved, experts? Heat exchanger equipment technology community