求高手指点，这个错误怎么解决？？不胜感激！！！！
---- WARNING ----
The symbolic refactorization failed.The matrix is structurally singular
at time = 0.0.
---- ERROR ----
Static equilibrium analysis has not been successful.
Restoring the input initial conditions...
---- ERROR ----
Initial Static Sim. Not Successful
Terminating Adams/Car usersubs...
Adams/Solver execution terminated by subprogram ERRMES
CPU time used = 1.7656 seconds
Analysis failed!
Please check the error messages to determine the cause.
在adams/car仿真中总是出现这个错误， 求高手指点，怎么解决，不胜感激！！！！
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