Question: How I solve hyperbolic of epidemic spread susceptible move and infected not move

The following is my code, it is working but when I add third model in pde1 , it is not working .

Note that: u :people move to right,w: move to left,v: infected people and stationary(not move)

please help me to reconize the problem

restart;
with(PDEtools);
with(plots);
pde1 := {diff(u(x, t), t) + Gamma*diff(u(x, t), x) = mu(w - u) - 0.5*beta*v*(w - u) - beta*u*v, diff(w(x, t), t) - Gamma*diff(w(x, t), x) = mu(u - w) - 0.5*beta*v*(u - w) - beta*w*v,diff(v(x,t),t)=beta*u*v-alpha*v};
  
IBC1 := {u(0, t) = 0, u(x, 0) = exp(-200*(x - 0.4)^2), w(1, t) = 0, w(x, 0) = exp(-200*(x - 0.6)^2),v(x,0)=0,v(0,t)=sin(t)};
mu := 0.0009;
Gamma := 10;alpha:=1;beta:=0.1
            
pds1 := pdsolve(pde1, IBC1, numeric, time = t, range = 0 .. 1, spacestep = 0.001);