DWSIM - ABS-01: Object reference not set to an instance of an object

ABS-01: Object reference not set to an instance of an object

I'm trying to reproduce a sample simulation available on DWSIM, the liquid-liquid extractor, but I'm getting the error message "object reference not set to an instance of an object".

On the tab general of my simulation, the stages available for the feed and solvent are stage 0, stage 1, stage 2 and stage 11; however, on the example the stages available are stage 0, stage 1, stage 2 and stage 3.

DWSIM 09-04-21, 12:18 a.m. lucianag

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Object reference not set to an instance of an object. This exception is thrown when you try to access a member—for instance, a method or a property—on a variable that currently holds a null reference.

iMessage for PC

10-04-21, 1:23 p.m. StephenHatcher

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