Error in 1st line of code

Hello. I am new to MATLAB and keep on getting this error every single time:

Error in MSDSOLV (line 1)

[T,Y]= ode45(@MSD,[0 10],[0.3,-0.1]);

This is my MSD code for the differential equations:

function dx=MSD (t,x);

dx=zeroes(2,1);

A=[0 1;-1 -2]

B=[0;1]

J=[-1+i -1-i]

K=acker(A,B,J)

u=-K*[x(1);x(2)]

dx(1)=x(2);

dx(2)=-x(1)-2*x(2)+u;

and this is my solver code for teh differential equations:

[T,Y]= ode45(@MSD,[0:0.1:10],[0.3,-0.1]);

figure(1)

plot(T,Y(:,1),'b')

grid

xlabel('time (s)')

ylabel ('x_1')

Thanks in advance