*** ERROR # 1000 *** in the input data: Incorrect data in field # 3

Hi I am new to this software and I received this message after running optistruct analysis and I dont understand what I did wrong? 

Thanks, Neek

 

*** ERROR # 1000 *** in the input data:
 Incorrect data in field # 3.

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

 There were 4200 error messages during input processing.
  The first message is repeated below:

  *** See next message about line 3516 from file:
      C:/Users/neel_/Desktop/Dissertation/3dmodel.fem
   'CQUAD4      1430       0      42      59    2059      43'

  *** ERROR # 1000 *** in the input data:
  Incorrect data in field # 3.

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

 ==== End of solver screen output ==== 

 ==== Job completed ====