Invalid causality sequence of subsystem

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Nhlakanipho

• March 25, 2025 04:44

Good day.

I am getting the following error " the casuality sequence of this subsystem is currently not valid". Because the simulation is running to a point, I am assuming that this is a result of an ambiguous causality sequence. The instruction is " update all expressions and resolve all issues before you can specify a precedent". My issue is I am not sure which expressions need to be updated as I have used the same expressions in other containers and they do not have this issue. Is there a way of identifying which expressions need updating in order to resolve this error? Kindly advise.

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  Jason

  • March 31, 2025 20:59

  Thanks for contacting the GoldSim Forum. Hopefully, we can resolve your issue without having to send us your model. Please let me start with a few follow up questions. Thanks for your patience!

  Can you please confirm that the error message is not appearing until after you start the simulation and interrupts the model after it was running to a point? This part of your message is very unexpected as usually this type of error occurs in Edit Mode. My guess is that it has to do with information you are passing from a subsystem to another subsystem that has some feedback. 

  Do you have discrete events in this model? Often, discrete events can occur at the same time and there could be ambiguity on which needs to happen before the other in the calculation sequence. If you go into the subsystem that the error message is coming from, then type the F10 key (also Model menu -> Causality Sequence), choose the option to see only the items within the current container and child containers, and see if you have any items in the list that indicate ambiguity by highlighting in red. Do you see anything there that is different from the other subsystems? FYI - "subsystem" is referring to your Containers. 

  Thanks for your patience!

  -Jason

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