About Optimize Cross Section component

Hello. I have created a parametric model of a simple truss structure and have applied loads to it for cross-section optimization using the Optimize Cross Section component. I have maximum utilization and maximum displacement as constraints. The problem is that when I set the maximum utilization to 0.8, I get an error as shown in the image, but when I set it to a smaller value of 0.7 or 0.6, I do not get an error. I am puzzled by this result, since the smaller the maximum utilization ratio, the more restrictive the conditions should be. I would be happy to know the cause.


ParametricTruss.gh (136.0 KB)