Custom Instruction Badly generated

Hi,

I´m trying to generate a custom instruction with the Nios 2 on a Cyclone 2. The SOPC builder generate correctly the CPU but the Quarty 5.1 fail each time to compile with the error :

Error: Port "E_ci_combo_a" does not exist in macrofunction "the_CPU_1"

Error: Port "E_ci_combo_b" does not exist in macrofunction "the_CPU_1"

...

Error: Port "E_ci_combo_writerc" does not exist in macrofunction "the_CPU_1"

But the "the_CPU_1" is entirely generated by the SOPC builder

The custom intruction is quite simple, just for testing

Here is the VHDL code

ENTITY transition IS

PORT

(

dataa : IN STD_LOGIC_VECTOR( 31 DOWNTO 0 );

datab : IN STD_LOGIC_VECTOR ( 31 DOWNTO 0 );

Result : OUT STD_LOGIC_VECTOR ( 31 DOWNTO 0 )

);

END transition;

ARCHITECTURE arch_transition OF transition IS

BEGIN

Result <= dataa + datab;

END arch_transition;

Do you have already heard about this problem ? Do you have any idea how to fix it ?

Thanks