Problem! Binary Divisor: Error (10028): Can't resolve multiple constant drivers

Ok! I've turned my inputs into unsigned, but now i have another problem...

Error (10327): VHDL error at DIV.vhd(60): can't determine definition of operator "">"" -- found 0 possible definitions

It is almost done! Please help me :)

Here's my code again:

---

p2: process (EDO, A, B, C, D, Ini, Dividendo, Divisor)

begin

case EDO is

when IDLE => if Ini = '0' then

EDO <= RES_1;

else

EDO <= IDLE;

end if;

when RES_1 => if A > Divisor or A = Divisor then

A_1 <= A - Dividendo;

Coci(3) <= '1';

EDO <= RES_2;

else

A_1 <= A;

Coci(3) <= '0';

EDO <= RES_2;

end if;

when RES_2 => if B > Divisor or B = Divisor then

B_1 <= B - Dividendo ;

Coci(2) <= '1';

EDO <= RES_3;

else

B_1 <= B;

Coci(2) <= '0';

EDO <= RES_3;

end if;

when RES_3 =>

if C > Divisor or C = Divisor then

C_1 <= C - Dividendo;

Coci(1) <= '1';

EDO <= RES_3;

else

C_1 <= C;

Coci(1) <= '0';

EDO <= RES_3;

end if;

when RES_4 =>

if D > Divisor or D = Divisor then

D_1 <= D - Dividendo;

Coci(0) <= '1';

EDO <= IDLE;

else

D_1 <= D;

Coci(0) <= '0';

EDO <= IDLE;

end if;

when others => null;

end case;

end process;