Regarding the issue with loops, I’m seeking help from experts

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I am a beginner in Aspen and would like the expertise of experts to help me solve my problems. Recently, I’ve been learning* and trying to do larger, more complex process simulations. I first performed a one-way simulation. Then, in some modules of the process, there are small loops, and those were also executed. But when trying to recycle the leftover material back to the raw material, things wouldn’t converge; it showed a message saying \"Calculations stopped because of missing property parameters\" – indicating that some property parameters were missing. I was very confused and didn’t know how to fix it. The method used is Broyden's. Is it to define the calculation order? I don’t really understand either; how can it be made to converge? Is the convergence nesting order applicable? I’m asking the experts for help, thank you! ! ! ! !