Matlab to C Conversion issue

I am running a program consists of two funtions demodualtion and modulation and by using command like

output= mainfuntion.Subfuntion(input arguments) i called them into script .while running the script i am getting the output and i am able to call the funtions individually.But while Converting the Matlab to C i am facing the issue...what should i do ?

classdef AmModDemod_DSB_C_Func
    methods(Static)
          function [z] = AmMod_DSB_C(Ac,Am,inp,carrier,carrierhilbert)
              inphasecomp=Ac*(1+(Am/Ac)*inp');
              outphasecomp=0;
              z=inphasecomp.*carrier-outphasecomp.*carrierhilbert;
          end
          function [out] = AmDemod_DSB_C(z,carrier)
             a=z.*carrier;    
             lpFilt = designfilt('lowpassfir', 'PassbandFrequency', 0.333,...
                 'StopbandFrequency',0.5, 'PassbandRipple', 0.02, ...
                 'StopbandAttenuation', 65, 'DesignMethod', 'kaiserwin');
             
             dataout = filter(lpFilt,a);
             DCB= dsp.DCBlocker('Algorithm','FIR','Length', 100);
             out=step(DCB,dataout');
          end
    end
end

mod=AmModDemod_DSB_C_Func.AmMod_DSB_C(Ac,Am,inp,carrier,carrierhilbert);
demod=AmModDemod_DSB_C_Func.AmDemod_DSB_C(mod,carrier);

This is type of the error i am getting ...