Error: Function definitions are not permitted in this context.

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I am using pdepe example given in your page https://www.mathworks.com/help/matlab/ref/pdepe.html

On executing the code, following error message appears, even though the output is obtained.

function [c,f,s] = pdex1pde(x,t,u,DuDx)
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Error: Function definitions are not permitted in this context.
MATLAB Version: 9.3.0.948333 (R2017b) Update 9
MATLAB License Number: 1110***
Operating System: Mac OS X  Version: 10.13.6 Build: 17G65 
Java Version: Java 1.8.0_144-b01 with Oracle Corporation Java HotSpot(TM) 64-Bit Server VM mixed mode
=========================================
m = 0;
x = linspace(0,1,20);
t = linspace(0,2,5);
sol = pdepe(m,@pdex1pde,@pdex1ic,@pdex1bc,x,t);
% Extract the first solution component as u.
u = sol(:,:,1);
% A surface plot is often a good way to study a solution.
surf(x,t,u) 
title('Numerical solution computed with 20 mesh points.')
xlabel('Distance x')
ylabel('Time t')
% A solution profile can also be illuminating.
figure
plot(x,u(end,:))
title('Solution at t = 2')
xlabel('Distance x')
ylabel('u(x,2)')
% --------------------------------------------------------------
function [c,f,s] = pdex1pde(x,t,u,DuDx)
c = pi^2;
f = DuDx;
s = 0;
% --------------------------------------------------------------
function u0 = pdex1ic(x)
u0 = sin(pi*x);
% --------------------------------------------------------------
function [pl,ql,pr,qr] = pdex1bc(xl,ul,xr,ur,t)
pl = ul;
ql = 0;
pr = pi * exp(-t);
qr = 1;