涡轮蜗杆仿真出错，请大虾助我

forzms

最近我在做一个机床的仿真，但是在一个涡轮蜗杆的仿真时出现一点问题，我是按照网上的一个涡轮蜗杆的仿真示例做的，单独做涡轮蜗杆的仿真是可以的，但是在我的机床上做涡轮蜗杆的仿真就出错，还请各位斑竹和高手指点！！

WARNING:    After 50 iterations of the calculations for the initial conditions, the
   mechanism has been assembled with a maximum-magnitude error of 7.63298E-04
   which does not satisfy the specified tolerance of 1.0E-10 .
WARNING:    After 25 iterations, the accelerations and constraint forces have
   not been resolved to within the specified tolerance of 1.0E-04 .
ERROR:      The simulation stopped at time = 3.0E-03.
  
   The equations of motion can not be solved at this point because of a
   singularity in the Jacobian matrix.  This singularity is due to the
   equation for JOINT MODEL_1.JOINT_52 ( FIXED JOI/52 Y ).
ERROR:      The matrix is numerically singular.
ERROR:      The simulation is terminating at time = 3.0E-03.
  
   ADAMS can not solve the equations of motion because the mechanism has
   "locked up."    At least one constraint  can  no longer be satisfied.
   ADAMS is unable to satisfy the constraint for: JOINT MODEL_1.JOINT_48 .
ERROR:   Abnormal termination encountered in ADAMS/Solver.