产生shift 的 smybol时有如下错误，请问是什么原因？
Error (10017): Can't create symbol for entity "shift" -- declaration for port "sel" cannot be of complex type
--cup_lib.vhd
LIBRARY IEEE;
USE IEEE.STD_LOGIC_1164.ALL;
USE IEEE.STD_LOGIC_ARITH.ALL;
PACKAGE cpu_lib IS
type t_shift is (shftpass,shtl,shtr,rotl,rotr);
subtype bit16 is std_logic_vector (15 downto 0);
end cpu_lib;
--shift.vhd
....
entity shift is
port ( a : in bit16;
sel: in t_shift;
y : out bit16
);
end shift;
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