从Moldex3d导入到abaqus中的inp格式文件作业后，总是出现错误，求大佬指点。The volume of 18024 elements is zero, small, or negative. Check coordinates or node numbering, or modify the mesh seed. In the case of a tetrahedron this error may indicate that all nodes are located very nearly in a plane. The elements have been identified in element set ErrElemVolSmallNegZero.