Hi Bernardo,
This problem is caused by an assumption we made in an equation that is part of an iterative solution in the solar field temperature calculations. This assumption causes the solution to fail in some special cases.
Your file has many inputs that are far enough from the typical design point, and are likely to cause these kinds of problems with the physical trough model.
We were able to fix this particular problem here:
github.com/NREL/ssc/pull/846/commits/3226103ce9e010c4c7a241aea59b73dca72685b2
I will email you a special version of the ssc.dll file that you can use with the SAM 2022.5.5 Beta version to fix this problem for your analysis.
It is possible that you will encounter other problems. Unfortunately we do not have the resources to address these kinds of problems at the moment. Please let me know if you do have other problems, but I cannot guarantee that we will be able to fix it in time for your work.
Best regards,
Paul.