matlab - Error in blackbox xilinx system generator -

i use xilinx system generator blocks in matlab , find block black box wich can generate , simulate vhdl code. programme simple program in vhdl port and,

--import std_logic ieee library library ieee; use ieee.std_logic_1164.all;  --entity declaration: name, inputs, outputs entity andgate                       port( a, b : in std_logic;             f : out std_logic); end andgate;  --functional description: how , gate works architecture func of andgate  begin   f <= , b;      end func; 

i simulate in xilinx blackbox , make simulation mode ise simulator because use xilinx .

i apreciate kind of :)

check gateway in, should select output boolean

also, check sampling time of system, should make equal 1