运行出错：*** ERROR # 153 ***

hhdxmxg

对某一厂房进行建模，设置荷载步后求解，给出的结果如下：
ANALYSIS RESULTS :
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ITERATION   0

*** ERROR #  153 ***
Exactly zero pivoting encountered during Numerical Factorization;
the model may have rigid body mode.
  Solver error no. =       -514
        spc set id =          1
             index =          1
Possible reasons are:
1) insufficiently constrained model,
2) having rigid body mechanisms within the model,
3) extremely ill-conditioned rigid element sets,
4) extremely thin shells (as used for  "skinning") that have MID2/MID3,
5) gap elements with extremely high stiffness (KA, especially KT or MU).
Check the model and rerun the problem.
(MECHCHECK may be used to find the rigid body modes.  To do so,
  change the input to be an eigenvalue analysis and add MECHCHECK.)
(WARNING: results obtained with MECHCHECK cannot be used because
           the model is changed internally.)
This error was detected in subroutine bcsmtxfct.

This error occurs in module "lstatdrv".

翻遍论坛有关此问题的帖子，均没有找到解决办法，请问各位该如何修改模型？谢谢！