When The following error occurred converting from sym to double: Unable to convert expression into double array

When I run my code, I keep getting this error: "The following error occurred converting from sym to double: Unable to convert expression into double array."

syms landa; 
rho=[4 6 8 2 2 8 6]';
h=[5 8 5 7 8 2]'; 
T(7)=rho(7); 
for i=6:-1:1
    T(i)=rho(i)*(T(i+1)+rho(i)*tanh(landa*h(i)))./...
        (rho(i)+T(i+1)*tanh(landa*h(i)));
end

Answer 1

[madhan ravi]

T=sym(zeros(size(rho))); % before the line T(7)...

[Sasan Fatahi]

Thank you