Error using Matlab HDL Coder

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.

1

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

2

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

3

n=length(x1);

4

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

5

for i=1:2*n-1

6

  if(i>n)

7

      j1=1;

8

      k1=2*n-i;

9

      j2=i-n+1;

10

      k2=n;

11

  else

12

      j1=n-i+1;

13

      k1=n;

14

      j2=1;

15

      k2=i;

16

  end

17

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

18

end

19

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.