Component Instance "XX" is not bound - Modelsim

Hi

I´m trying to simulate a design in modelsim altera starter edition 6.6d.

All the files (vhd) compile but when I start the simulation a warning message is displayed:

Warning: (vsim-3473) Component instance "adder1: altfp_add_sub" is not bound.

I can run the simulation but the output of this adder is always "XXXX".

It also happen with a FP divider but not with a FP multiplier, it has not problem.

This is how I'm creating the instance of the altfp_add_sub component:

LIBRARY altera_mf;

USE altera_mf.altera_mf_components.all;

.

.

.

adder1 : altfp_add_sub

GENERIC MAP(

[/INDENT]denormal_support => "YES",

[/INDENT]intended_device_family => "Stratix III",

[/INDENT]direction => "VARIABLE",

[/INDENT]exception_handling => "YES",

[/INDENT]optimize => "SPEED",

[/INDENT]pipeline => 8,

[/INDENT]reduced_functionality => "NO",

[/INDENT]rounding => "TO_NEAREST",

[/INDENT]speed_optimized => "STRATIX_ONLY",

[/INDENT]width_exp => 8,

[/INDENT]width_man => 23,

[/INDENT]lpm_hint => "UNUSED",

[/INDENT]lpm_type => "altfp_add_sub")

PORT MAP(

[/INDENT]aclr => clr,

[/INDENT]add_sub => add_sub_reg,

[/INDENT]clk_en => en,

[/INDENT]clock => clock,

[/INDENT]dataa => output_mux1_reg,

[/INDENT]datab => output_mux2_reg,

[/INDENT]result => output_adder);

Please, can someone tell me what is wrong?

Thanks