vhdl 程序，VHDL编的闹钟系统的预置寄存器部分有如下错误 帮忙看

LIBRARY IEEE;
USE IEEE.STD_LOGIC_1164.ALL;
USE IEEE.STD_LOGIC_UNSIGNED.ALL;
USE WORK.P_ALARM.ALL;
ENTITY KEYBUFFER IS
PORT(KEY:IN STD_LOGIC;
CLK:IN STD_LOGIC;
RESET:IN STD_LOGIC;
KEYNUM:OUT STD_LOGIC_VECTOR(3 DOWNTO 0);
NEW_TIME:OUT T_CLOCK_TIME);
END ENTITY KEYBUFFER;
ARCHITECTURE ART OF KEYBUFFER IS
SIGNAL N_T:T_CLOCK_TIME;
SIGNAL CNT:STD_LOGIC_VECTOR(3 DOWNTO 0);
SIGNAL TEMP:BIT_VECTOR(3 TO 0);
BEGIN
PROCESS(CLK) IS
BEGIN
IF (CLK'EVENT AND CLK='1') THEN
IF CNT=9 THEN
CNT<="0000";
ELSE
CNT<=CNT+'1';
END IF;
END IF;
KEYNUM<=CNT;
END PROCESS;
SHIFT:PROCESS(RESET,KEY) IS
BEGIN
IF (RESET='1') THEN
N_T(23 TO 20)<="0000";
N_T(19 TO 16)<="0000";
N_T(15 TO 12)<="0000";
N_T(11 TO 8)<="0000";
N_T(7 TO 4)<="0000";
N_T(3 TO 0)<="0000";
ELSIF (KEY'EVENT AND KEY='1') THEN
FOR I IN 5 DOWNTO 1 LOOP
N_T(I+18 TO 15+I)<=N_T(14+I TO 11+I);
END LOOP;
N_T(3 TO 0)<=TEMP;
END IF;
END PROCESS;
NEW_TIME<=N_T;
END ARCHITECTURE ART;
Error (10476): VHDL error at KEYBUFFER.vhd(41): type of identifier "TEMP" does not agree with its usage as "T_CLOCK_TIME" type