The nodes for element 1 (assembly) are coincident.

两结合面之间设置了弹簧阻尼单元，这两结合面之间没有缝隙，但是运行的时候出现 “ The nodes for element 1 (assembly) are coincident. The line-of-action can not be determined” 。哪位高手能帮我解决一下， 小弟感激不尽！