abaqus出错，大神帮看下。

小弟新手，用hypermesh做前处理，然后导入abaqus求解，是静力学问题。然后就报好多这样的错：

No bulk modulus is defined for acoustic element 1539867 instance part-1-1. All acoustic elements must have nonzero bulk modulus defined using *material and *acoustic medium.

Initialization of acoustic element material point data for element 401 has failed because no bulk modulus exists for thiselement.

在abaqus里面重新设置材料还是这样。求大神帮帮忙。