matrix array in vhdl

This is my transpose code:

package newtype is

type matrix_t is array (0 to 8, 0 to 8) of integer;

end newtype;

library ieee;

use ieee.std_logic_1164.all;

use ieee.numeric_std.all;

use work.newtype.all;

entity transpose is

port(input: in matrix_t;

clk: in std_logic;

transposed_matrix: out matrix_t);

end transpose;

architecture arch of transpose is

function change (matrix: matrix_t) return matrix_t is

variable ret: matrix_t;

begin

for i in matrix'range(1) loop

for j in matrix'range(2) loop

ret (j,i):= matrix (i,j);

end loop;

end loop;

return ret;

end function;

begin

transposed_matrix <= change (input);

end arch;

The same error with my previous code that not use a function is occurs;

Error: Design requires 5185 I/O resources -- too many to fit in 1264 available in the selected device or any device in the device family.

Why the same error still occurs? I confuse now, need your helps. Many thanks.