一个桁架结构的点与刚性分析平面受力接触问题？

我在用ABAQUS进行分析时，总是算了一下就出错，看了一下warning主要是这些问题，求问怎么解决
Slave surface assembly__pickedset113_cns_ is a node-based surface used with surface to surface approach. In order to obtain improved stress accuracy with this approach, an element-based surface should be used instead. 

Path based tracking is defined in contact pair (assembly__pickedset113_cns_,assembly_bpl-2_rigidsurface_). Path based tracking cannot be used with analytical rigid master surfaces, the state based tracking algorithm will be used instead.
分析的内容主要是一个桁架结构的点与刚性分析平面受力接触，且桁架结构受力塑性变形