Error (10500): VHDL syntax error at nios2_led.vhd(5) near text "ã"; expecting "end", or "begin", or

[beginner]

I use Quartus Prime Lite Edition.I'm having trouble compiling.

I wrote the following code, but I get an error.I don't think the syntax is a problem, but why? Let me know if you understand.

----------

library ieee;
use ieee.std_logic_1164.all;
entity led_press_button_nios2 is
port (
CLK : in std_logic;
button : in std_logic;
LED : out std_logic
);
end led_press_button_nios2;

architecture behavioral of led_press_button_nios2 is
component nios2_system is
port(
button_pio : in std_logic;
clk_clk : in std_logic;
led_pio : out std_logic
);
end component nios2_system;

signal button_wire : std_logic;
signal led_wire : std_logic;
begin
button_wire <= not button;

nios2:nios2_system
port map(
clk_clk => CLK,
button_pio => button_wire,
led_pio => led_wire
);
LED <= not led_wire;
end behavioral;

----------

Error content

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Error (10500): VHDL syntax error at nios2_led.vhd(5) near text "ã"; expecting "end", or "begin", or a declaration statement
Error (10500): VHDL syntax error at nios2_led.vhd(5) near text 
Error (10500): VHDL syntax error at nios2_led.vhd(6) near text 
Error (10500): VHDL syntax error at nios2_led.vhd(7) near text 
Error (10500): VHDL syntax error at nios2_led.vhd(8) near text 
Error (10500): VHDL syntax error at nios2_led.vhd(9) near text

Error (10523): Ignored construct Nios2_LED at nios2_led.vhd(4) due to previous errors
Error (10500): VHDL syntax error at nios2_led.vhd(12) near text "ã"; expecting "begin", or a declaration statement
Error (10500): VHDL syntax error at nios2_led.vhd(12) near text 
Error (10500): VHDL syntax error at nios2_led.vhd(13) near text "ã"; expecting "end", or "port", or "generic"
Error (10500): VHDL syntax error at nios2_led.vhd(13) near text 
Error (10500): VHDL syntax error at nios2_led.vhd(14) near text 
Error (10500): VHDL syntax error at nios2_led.vhd(15) near text 
Error (10500): VHDL syntax error at nios2_led.vhd(16) near text 
Error (10500): VHDL syntax error at nios2_led.vhd(17) near text
Error (10500): VHDL syntax error at nios2_led.vhd(18) near text 
Error (10500): VHDL syntax error at nios2_led.vhd(19) near text 
Error (10500): VHDL syntax error at nios2_led.vhd(20) near text
Error (10500): VHDL syntax error at nios2_led.vhd(22) near text 

[RRomano001]

 Hello, your code as appear here compile hassle free.

Error (10500): VHDL syntax error at nios2_led.vhd(5) near text "ã"; expecting "end", or "begin", or a declaration statement

inspect or delete and rewrite offending lines one at a time

supposing line 5 is after port declaration a forbidden character seem there.

[EricMunYew_C_Intel]

Can you try below.

component xxx

  port ();

end component;