Everytime I run the simulation to find the maximum gain I receive the following error:

{{ Template based post-processing result "GainTheta0Phi0":

Error in calling "Evaluate1D" function ((9999) No calculated Farfield Result with correct excitation string found.(Line:1930)) }}

I tried to follow the usual steps by adding farfield broadband and all the steps but I still have the same error.

Any Ideas?