Qartus VHDL library problem

Yes I did.

But if I change the library name from: library cycloneiii ; use cycloneiii.cycloneiii_components.all;

to: library cycloneiii_components ;use cycloneiii_components.all;

Quartus gives another error: "Error (10482): VHDL error at top_level.vhd(47): object "cycloneiii_lcell_comb" is used but not declared"

If I add the declaration in the architecture of top_level:

component cycloneiii_lcell_comb

generic (

lut_mask : std_logic_vector(15 downto 0) := (OTHERS => '1');

sum_lutc_input : string := "datac";

lpm_type : string := "cycloneiii_lcell_comb"

);

port (

dataa : in std_logic := '1';

datab : in std_logic := '1';

datac : in std_logic := '1';

datad : in std_logic := '1';

cin : in std_logic := '0';

combout : out std_logic;

cout : out std_logic

);

end component;

the compilation was successful.

Any ideas??