VHDL Error. Type of identifier does not agree with it's usage

--mux32bit

library IEEE;

use IEEE.STD_LOGIC_1164.ALL;

use IEEE.STD_LOGIC_ARITH.ALL;

use IEEE.STD_LOGIC_UNSIGNED.ALL;

use ieee.numeric_std;

entity mux_aluop is

port (

in1: in std_logic_vector(31 downto 0);

in2: in std_LOGIC_VECTOR(31 downto 0);

in3: in std_logic_vector(31 downto 0);

mux_select: in STD_LOGIC_vector(1 downto 0);

mux_out: out STD_LOGIC_VECTOR(31 downto 0)

);

end mux_aluop;

architecture behave of mux_aluop is

begin

process(mux_select)

begin

if mux_select = "00" then

mux_out<=in1;

elsif mux_select = "01" then

mux_out<=in2;

elsif mux_select = "10" then

mux_out<=in3;

end if;

end process;

end behave;