Optistruct施加Accel加速度时报错，说是缺少联系卡片？

 *** See next message about line 201 from file: F:/temp/Q/AA.fem

  "ACCEL          3       0    10.0    20.0    30.0"

 *** ERROR # 1125 *** in the input data:

 ACCEL requires at least one continuation card.