My Graph isn't displaying

i am trying to plot my graph. the code does not show any error, but the graph is not displying..

%function Modified

lags = 0.2;

tspan = [0,10];

sol = dde23(@ddehs, lags, @hshist, tspan);

time = sol.x;
S    = sol.y(1,:);
I    = sol.y(2,:);
V    = sol.y(3,:);
T    = sol.y(4,:);
R    = sol.y(5,:);

hold on

plot(time,I,'b')
plot(time,S,'r')
plot(time,V,'g')
plot(time,T,'k')
plot(time,R,'y')

xlabel('Time (Years)');

legend('S_h','I_h','V_h','T_h','R_h')

hold off

%end

function dydt = ddehs(~,y,z)

        Lh = 10000; muh = 0.06;
        uh = 0.09;  Bh  = 0.5;
        mud = 0.08; tau = 0.2;
        ah = 1; mh = 0.2; bh =0.5; rh = 0.5;
        dh = 0.21;

        ylag1 = z(2,1);
        

        dydt = [ Lh - Bh*y(1)*ylag1*exp(-mud*tau)-(muh + uh)*y(1) + bh*y(3) + dh*y(5)
                 Bh*y(1)*ylag1*exp(-mud*tau) - (muh + mh + ah)*y(2)
                 uh*y(1) - (bh + muh)*y(3)
                 ah*y(2) - (muh + rh)*y(4)
                 rh*y(4) - (muh + dh)*y(5) ];

end

function s = hshist(~)
        
         s = ones(5,1);

end

[Torsten]

I reduced tspan to [0 10], set s = ones(5,1); instead of s = ones(3,1); and changed muH to muh in one position in the definition of dydt.

[Musa Abdullahi]

Thank you.. You have been of great help to me.. Thank you once again