I have incoporated a zerolength section element in my model, but when I run the model, a error as below was appeared.

I found it is a bug for stko in this disscussion: viewtopic.php?f=45&t=1949&p=3574&hilit= ... tion#p3574.

Have it still not been sovled? And if I want to use the zerolengthsection element in stko, how can I solve this problem.