Hi Ding-Jun Huang
I downloaded the battery clip example from forum. When I run this file, I didnt see any issue and the model converged easily, with 2019R2 AIM.
Did you modify the setup of this example before running at your end. If yes, what changes you made?
The error you are getting indicates the model is not properly constrained. As the model is working fine at my end, it seems some changes you added might be causing the problem with the model at your end.
Thanks & Regards,