Hai everyone, Can anybody tell what this error states and how to resolve this ?

Error - Template based post-processing result "Multiple polar plots (Directivity plot at each frq, const Theta=90)":Error in calling "Evaluate1DResult" function ((9999) No calculated Farfield Result with correct excitation string found.

I am trying to get the plots for the multiple cuts for the designed antenna at theta=90deg 

CST Studio Suite ​​​​​​​