Fehler beim Erzeugen eines Test-Bench-Files

Folgende Files habe ich verwendet. Vielleicht mag ja wer so nett sein, 
und es mal testen:

matrix_test.vhdl

library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
use IEEE.NUMERIC_STD.ALL;

library work;
use work.matrix_dec.ALL;

entity Matrix_Test is
    Port ( clk : in  STD_LOGIC;
           x : in   matrix_2d(0 to 2, 0 to 2);
           y : out  matrix_2d(0 to 2, 0 to 2));
end Matrix_Test;

architecture Behavioral of Matrix_Test is
  signal x_net :  matrix_2d(0 to 2, 0 to 2);
begin
  x_net <= x;
  y <= x_net;

end Behavioral;



---------------------------------------
matrix_dec.vhdl:

library IEEE;
use IEEE.STD_LOGIC_1164.all;

PACKAGE matrix_dec IS
  type matrix_2d is array (NATURAL RANGE <>,NATURAL RANGE <>) of 
STD_LOGIC_VECTOR (17 downto 0) ;
END matrix_dec;

package body matrix_dec is

end matrix_dec;