hyperworks遇到的问题，如何解决？

*** ERROR #  79 ***

  DTPG data does not create any DVGRID data.

  There are no free referenced GRIDs.

  There may be no elements associated with the PSHELL data.

  LOAD or BOTH may be specified and all grids may be loaded.

  BC, SPC, or BOTH may be specified and all grids may be SPCed.