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System Modeler User Conference 2026

We've just added a new YouTube playlist featuring presentations from the System Modeler User Conference! This collection brings together all talks from industry experts as they dive into the intersection of Wolfram System Modeler, Modelica, and FMI-based workflows.

Start watching now on the Wolfram R&D YouTube channel!

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POSTED BY: Keren Garcia
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Thanks for reporting this, and I’m glad to hear you found the User Conference helpful!

I’ve attached an updated WSMExercises file. The error you encountered is caused by changes in the most recent version of the built-in libraries, which modified some component paths. As a result, a few references in the original exercise models no longer resolve correctly. We’re in the process of updating the exercise materials to fix these changes.

In the meantime, you can use the updated WSMExercises package that I have attached.

Please let me know if you run into any additional issues, or if anything else seems unclear.

Attachments:
WSMExercises.mo
POSTED BY: Ankit Naik

Ankit, Thank you for the tip on how to designate my own local temp directory and working directory. I created these and "Excluded" them both from scrutiny by Norton anti-virus software. And YEA!, no more annoying delays from unnecessary executable file examination. Thank you. Mike
POSTED BY: Michael Ulrey
  1. Can you try the following?¨

a) Change the "Custom Temporary Directory" (Tools -> Options -> Global ->General) to a directory in your account (the default temporary directory that we use is sometimes considered extra dangerous by some antivirus software). Link here: https://reference.wolfram.com/system-modeler/UserGuide/SimulationCenterOptions.html#720972770

b) Make the antivirus "trust" that directory
POSTED BY: Ankit Naik
  1. That is my fault, mixing up with "Modelica" and "MSL". You can ignore this.
  2. These notification messages are not errors, so you can still simulate and plot the results.

The reason you see them—even though you have specified initial values—is that those values are treated as guess values by the solver. They serve only as starting points, not as enforced conditions.

If you want to force the simulation to use a specific initial value, you need to set fixed = true, which instructs the solver to treat that value as fixed.

However, be cautious: forcing values can sometimes lead to unforeseen consequences. If the imposed values are inconsistent with the rest of the equation system, the solver may be unable to find a solution.enter image description here
POSTED BY: Ankit Naik
POSTED BY: Michael Ulrey

Ankit, Thanks for the quick reply! Your assessment of the problem is exactly what I suspected. I will try out the new exercises and let you know if there are any remaining issues. One more thing, though. It was actually a good thing that I had a few issues like this. It prompted me to do some really deep dives into the libraries of components, to look at the model from different viewpoints, and generally become more familiar with the tool. In other words, it was a good learning experience! Cheers, Mike
POSTED BY: Michael Ulrey

I don't know if this is the right place to ask this question, so if it is not, please re-direct me. I attended the users' conference (very helpful and informative, by the way). However, I ran into a couple of snags when trying to do the exercises from the download materials. In particular, when I tried to simulate the Inverted Pendulum model, I get the error message Building "WSMExercises.Ex4.MyModels.InvertedPendulum" as experiment "InvertedPendulum 1" started at 19:40:14 Error: WSMExercises.Ex4.MyModels.InvertedPendulum [4:62-4:62] Invalid binding. Modelica.Mechanics.MultiBody.Forces.WorldForce does not have an element named Ntom.

I think this has something to do with the WorldForce icon being grayed out on the first pass (the notebook instructions say that "we will get to that later"), but being relatively new to SystemModeler, I can't be sure. Can anyone give me a hint? P.S. I would add a notebook, but I can't find where the models go when I click the Save icon. They do not appear in the same folder as the downloaded materials, neither do they appear where the program files reside. Maybe someone can give me a hint about that too.
POSTED BY: Michael Ulrey
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