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Error for vibration analysis

I am getting the following error for my vibration analysis
 
Ant lead?
 
ERROR:  The state matrix and eigen vector matrix are not of compatible sizes.
  A: 2 x 2
  B: 0 x 0
  C: 0 x 0
  D: 0 x 0
 
ERROR:  The state matrix and eigen vector matrix are not of compatible sizes.
  A: 2 x 2
  B: 0 x 0
  C: 0 x 0
  D: 0 x 0
 
ERROR:  ---------------------------------------------------------------------
ERROR:  Error detected on line number 19, character 83 of the macro '.vibration.ForcedVibrationAnalysis.create_FVA'.
ERROR:  FVA_Solve: No Solution. 
ERROR:  FVA_Solve: No Solution. 
ERROR:  The command was not executed.
ERROR:  +1>> variable modify variable=.mdi.ErrNo int=(eval(FVA_Solve(."Abbas".FVA_1)))
ERROR:  ---------------------------------------------------------------------
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