Occurance of error "Undefined function 'mtimes' for input arguments of type 'cell' " in pdepe

Hi, I am trying to solve a partial differential equation which is elliptic - depending upon x and r. Its general structure is like:- U1t = a(U1,x)*U2t + b(U,x)*U1xx; The U2t part is separate DE:- U2t = (1/r)*(r D(r)*U2r)r (Subscript here denote differentiating variable) I solved separately r-dependent PDE by using pdepe. Now I want to incorporate that solution in original PDE. I did it as following:-

%% Water Diffusion in fiber m = 1; %Indicates symmetry in the problem x = linspace(0,1.12*10^-5,501); t = linspace(0,400,801); u = pdepe(m,@petdiff, @petdiffinitial, @petdiffbc, x,t);

%% Incorporating fiber-diffusion in main PDE uf= (u*x')/(501*1.12*10^-5); crate = 30*uf*epsf; m = 0; x = linspace(0,1.12*10^-5,500); t = linspace(0,400,800); intsolve = pdepe(m, @pettfdiff, @pettwinit, @pettfbc, x, t);

The value of crate was used in definitions of main pde as follows

function [c, b, s] = pettfdiff(x,t,u,DuDx)

c = [rhoL; 1]; b = DuDx.*[rhoL*(1/tortul)*preDl*u(1); (1/tortug)*Dg];

s = [ (epsf + u(1))/(epsp)}*crate(2*t+1) (u(1)/epsp)^0.75)*((1-u(1) - epsf)/epsp)}*crate(2*t+1)];

When I run file to solve main pde. It gives error that " Undefined function 'mtimes' for input arguments of type 'cell'." This error is regarding use of 'crate'. Why matlab is giving this error. How can I resolve it? Any help is greatly aprreciated. Thanks in advance.

Pratik Patil