Gray Code

Ok well still working on it, here is ver. 2 of the code:

library IEEE;
use IEEE.STD_LOGIC_1164.all; 
entity gray_2_bar is
    port( gray : in std_logic_vector (3 downto 0);
    bar_graph : out std_logic_vector (9 downto 0));
    
    attribute loc : string;
    attribute loc of gray: signal is "P2,P3,P4,P5";
    attribute loc of bar_graph: signal is "P27,P26,P25,P24,P23,P21,P20,P19,P18,P17"; 
end gray_2_bar;
--}} End of automatically maintained section  
architecture gray2bar1 of gray_2_bar is
    signal temp: std_logic_vector (3 downto 0);
begin
    temp <= gray;
    with temp select 
    bar_graph <= "1111111110" when "0000",
    <= "1111111100" when "0001", --Still the same error on the same line.
    <= "1111111000" when "0011",
    <= "1111110000" when "0010",
    <= "1111100000" when "0110",
    <= "1111000000" when "0111",
    <= "1110000000" when "0101",
    <= "1100000000" when "0100",
    <= "1000000000" when "1100",
    <= "0000000000" when "1101",
    <= "0000000000" when others;
end gray2bar1;