Error while debugging.Hi all.While running the program message showing-"Error using sym/max (line 123) Input arguments must be convertible to floating-point numbers. Error in untitled2 (line 159) [bestfun,b​estrun]=ma​x(fvalue) "

gbest;

f2update=zeros(4,1)

f2update = (Cfr.*gbest+ Vfr.* Qfr)

syms fvalue positive rational

fvalue=symsum(f1,0, Zka)- symsum(f2update,0, 1)-symsum(f3,0, 1)-symsum(f4,0, Zka)-symsum(f5,0, Zka);

%fff(ite)=fvalue(ite,:);

rgbest(run,:)=gbest;

disp(sprintf('--------------------------------------'));