how to solve a system of nine equation with ode45,

When i run this code:

a =0.2;

b =0.2;

c = 7.0;

sigma = 0.22;

k = 4;

rand('seed',0);

y0 = rand(1,9)

%MyTols = odeset('RelTol',1e-5,'AbsTol',1e-7);

tspan = 0.0:0.05:500;

l = length(tspan)

rossler = @(t,u) [

         sigma*k*u(1)-u(4)-u(7);

         sigma*k*u(2)-u(5)-u(8);

         sigma*k*u(3)-u(6)-u(9);

         u(1)+a*u(2);

         u(4)+a*u(5);  

         u(7)+a*u(8);

         0.25*u(1)+(0.74-c)*u(7);

         0.25*u(2)+(0.74-c)*u(8);

         0.25*u(3)+(0.74-c)*u(9);
                 ];

[T,Y] = ode45(rossler,tspan,y0);

size(T)

size(Y)

it show this message-

Warning: Failure at t=2.528325e+002.  Unable to meet integration tolerances without reducing the step size below the
smallest value allowed (4.547474e-013) at time t.

please help me. i didnt get this .

Thanks in advance