帮助文件中这么说的。
The Contact Wizard remains unavailable (dimmed) if you haven't meshed any portion of your model. If you wish to create a rigid-flexible model, mesh only those parts of the model which will be used as flexible contact surfaces (do not mesh the rigid target surfaces) before launching the wizard. If you wish to create a flexible-flexible model, mesh all parts of the model which will be used as contact surfaces (including target surfaces) before launching the wizard.
假如在定义接触对前,不对刚性目标面划分网格,只对柔性接触面划分网格,check接触对没有错误。但是定义接触对后再对刚性目标面划分网格,然后再check接触对,就出现定义接触对失败的错误。