SPECTRUM ANALYSIS-Subscript range error
 

Dear all,
While doing Spectrum analysis i got the following SUBSCRIPT range error .
I get the following error message when running Spectrum analysis.

"Subscript range error. Parameter_ZC is dimensioned as 3, but location 4 is being requested"

"No data exists for dimensioned parameter_ZC with subscript 4"

"The above error occurred processing field = _ZC(_Z1) Line = *SET,_z3,(_z3+1)."

I did a modal analysis before the spectrum analysis. I dont really understand how should SED be use in ANSYS 14.0. THis option is not available in older version.

PF can be calculated, but when I click on "Calc Control", the error message appear.

Please help.