Convert Matlab Code to VHDL small example

Hi, Can some one please help out.Thanks. I am trying to convert below code to VHDL using HDL Coder but getting error. The HDL Coder Block file is also attached .Please can you have a look on it and see whats the mistake in block diagram.

x1=[1 2 3 4 5 6 7 8 9];

x2=[3 4 5 6 7 8 9 2 1];

n=length(x1);

xc=zeros(2*n-1,1);

for i=1:2*n-1

if(i>n)

j1=1;

k1=2*n-i;

j2=i-n+1;

k2=n;

else

j1=n-i+1;

k1=n;

j2=1;

k2=i;

end

xc(i)=sum(conj(x1(j1:k1)).*x2(j2:k2));

end

xc=flipud(xc);

Error:

Cannot connect to model 'prc4'; please try Update Diagram (Ctrl-D).

Error due to multiple causes.

Errors occurred during parsing of MATLAB function 'MATLAB Function'(#24)

Error in port widths or dimensions. Output port 1 of 'prc4/MATLAB Function/u' is a one dimensional vector with 1 elements.

Can some please help me out what could be the reason of this error.