errors in my baja buggy simulation

 *** ERROR # 1026 *** in the input data:
 Duplicate ID's not allowed.

************************************************************************

 There were 2 error messages during input processing.
  The first message is repeated below:

  *** See next message about line 104117 from file:
      C:/Users/Ketan/Desktop/hyperworks first mesh results/new mesh/half cut with midsurface66@mesh.fem
   'CTRIA3     97499       1   91469   19215   91469'

  *** ERROR # 1026 *** in the input data:
  Duplicate ID's not allowed.