内聚力模型划分网格错误

层板界面采用CZM，有两层界面，一层CZMESH可以用，但是划到另外一层时出现了下面的对话框：elements to be separated by cohesive elements are of more than one stiffness（45 and 205 perhaps more) the CZMESH is ignored.请帮帮忙。