[vlsi-nastava:2002] - problem by Nikola Puzovic <puzza@sezampro.yu>

Kada probam da kompajliram sounter.vhd dobijam sledece greske :

Error: COMP96_0071: counter.vhd : (23, 12): Operator "<" is not defined 
for such operands.
Error: COMP96_0104: counter.vhd : (23, 12): Undefined type of expression.
Error: COMP96_0071: counter.vhd : (24, 17): Operator "+" is not defined 
for such operands.
Error: COMP96_0104: counter.vhd : (24, 17): Undefined type of expression.
Compile failure 4 Errors 0 Warnings  Analysis time :  0.1 [s]

O cemu se radi?
Pozdrav,
Nikola
library IEEE;
use IEEE.std_logic_1164.all;

entity COUNTER is
    port (
        CLK: in STD_LOGIC;
        Q: out STD_LOGIC_VECTOR (3 downto 0);
        RESET: in STD_LOGIC
    );
end COUNTER;

architecture COUNTER of COUNTER is
begin


process (CLK, RESET)
variable Qint: STD_LOGIC_VECTOR (3 downto 0);
begin
   if RESET='1' then  
      Qint := "0000"; 
   else
      if CLK'event and CLK='1' then
        if Qint<9 then
          Qint:=Qint+1;
        else
          Qint:="0000";
        end if;
     end if;
   end if;
   Q <= Qint;
end process;
end COUNTER;