Kombinatorische Schleife in JK-FF

Hallo,

Ich habe in VHDL ein JK-FF Programmiert und möchte es als Zähler nutzen.
Schon wenn wenn es überhaupt nur genutzt wrden soll, Bekomme ich bei 
Implement Design die Fehlermeldung:
WARNING:Par:100 - Design is not completely routed. There are 8 signals 
that are not completely routed in this design. See the "Z1.unroutes" 
file for a list of all unrouted signals. Check for other warnings in 
your PAR report that might indicate why these nets are unroutable. These 
nets can also be evaluated in FPGA Editor by selecting "Unrouted Nets" 
in the List Window.

In Z1-Unrouted Steht nun:
WARNING:ParHelpers:360 - Design is not completely routed.
   GLOBAL_LOGIC1
   g0/Q
   g0/Q_not0001
   led_0_OBUF
   led_0_OBUF1
   led_1_OBUF
   led_2_OBUF
   led_3_OBUF

Das Programm:
library IEEE;
use IEEE.STD_LOGIC_1164.ALL;

entity Z1 is
Port (sw : in  STD_LOGIC_VECTOR(7 downto 0);
    led : out  STD_LOGIC_VECTOR(7 downto 0));
end Z1;

architecture Behavioral of Z1 is
component jkff              --Die Komponente rsff soll genutzt werden
  port(  Tackt  : in STD_LOGIC;  --Übergabe an die Komponente
      J     : in STD_LOGIC;
      K     : in STD_LOGIC;
       reset  : in STD_LOGIC;
      Q     : buffer STD_LOGIC);
end Component;
signal a: STD_LOGIC_Vector(3 downto 0);  --Interne Signale
begin
g0: jkff port map (sw(0),sw(1),sw(2),sw(3),a(0));
led(0)<=sw(0);
led(1)<=sw(1);
led(2)<=sw(2);
led(3)<=sw(3);
led(4)<=a(0);

end Behavioral;


--JK-FF
library IEEE;
use IEEE.STD_LOGIC_1164.ALL;

entity JKFF is
    Port (Tackt,J,K,Reset: in STD_LOGIC;
           Q: buffer STD_LOGIC);
end JKFF;

architecture Behavioral of JKFF is
begin
process (Tackt,reset)
  begin
  if reset='1' then
    q<='0';
  elsif (Tackt 'event and Tackt = '0') then
      if(J='1' and K = '0') then  --Setzen
        q<='1';
      elsif(j='0' and K = '1') then--Rüchsetzen
        q<='0';
      elsif(j='1' and k='1') then--Toggeln
        q<=not q;
      else q<=q;
    end if;
  end if;
end Process;
end Behavioral;

Wäre klasse wenn wenn jemand wüsste was nicht OK ist.