write code vhdl cruise control how ???

i try to isolation cruise control by method Components

i have this (Error (10465): VHDL error at cruise_control.vhd(31): name "cruise_on" cannot be used because it is already used for a previously declared item)

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LIBRARY ieee;

USE ieee.std_logic_1164.all;

ENTITY cruise_control IS

PORT (cancel, accleartor, Rest, break, set, cruise_on, cruise_off : IN STD_LOGIC;

setspeed: OUT STD_LOGIC);

END cruise_control;

ARCHITECTURE structural OF cruise_control IS

COMPONENT crease_speed IS

PORT (accleartor, Rest: IN STD_LOGIC; setspeed: OUT STD_LOGIC);

END COMPONENT;

COMPONENT increase_speed IS

PORT (break, set: IN STD_LOGIC; setspeed: OUT STD_LOGIC);

END COMPONENT;

COMPONENT cancel1 IS

PORT (cruise_off: IN STD_LOGIC; setspeed: OUT STD_LOGIC);

END COMPONENT;

COMPONENT cruise IS

PORT (cruise_on: IN STD_LOGIC; setspeed: OUT STD_LOGIC);

END COMPONENT;

SIGNAL cruise_on: STD_LOGIC;

BEGIN

U1: crease_speed PORT MAP (accleartor, Rest, setspeed);

U2: increase_speed PORT MAP (break, set, d, setspeed);

U3: cancel1 PORT MAP (cruise_off, setspeed);

U4: cruise PORT MAP (cruise_on, setspeed);

END structural;

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