abaqus 钢结构先线单元建模出现下面这种歌报错怎么修改呀？

 Normal cannot be computed in 20 elements. The nodal coordinates may be incorrect or the element aspect ratio may exceed 1000 to 1. The elements have been identified in element set ErrElemNormal.

Error in job Job-1: 20 elements have zero length. The elements have been identified in element set ErrElemZeroLength.

Error in job Job-1: 20 elements have small or zero length. The elements have been identified in element set ErrElemLenSmallNegZero.

Error in job Job-1: Error in defining or computing beam section normal in 20 elements. The elements have been identified in element set ErrElemBeamSecNormal.

Error in job Job-1: The beam cross-section direction vectors coincide at a node in 20 elements. The elements have been identified in element set ErrElemBeamSecDirVect.