error in table ...how to fix it ?

hi all

am working on a Hotel Reservation program ... and i have a proble with my tables...

i already finish the design and it seems ok for me ...but when i came to create the SQL Code for the tables it didnt work ... its giving me an error massage where is no error ... i seached and tryed my best to find a soulution but i couldnt ...

the error massage am getting is
ERROR at line 9:
ORA-00906: missing left parenthesis

all the parenthesis are exsist ...

could any one help me with this ...

here is the table that is not working ...

CREATE TABLE GUEST_ROOM
(
ROOM_NO NUMBER(3),
RESERVATION_NO NUMBER(5),
GUEST_NUMBER NUMBER(5) ,
ACTUAL_CHECKIN_DATE DATE NOT NULL,
ACTUAL_CHECKOUT_DATE DATE NOT NULL ,
CONSTRAINT ROOM_NO_FK FOREIGN KEY
REFERENCES ROOM_NO (ROOM_NO),
CONSTRAINT ROOM_RESERVATION_NO_FK FOREIGN KEY (RESERVATION_NO)
REFERENCES RESERVATION (RESERVATION_NO),
CONSTRAINT ROOM_GUEST_NUMBER_FK FOREIGN KEY (GUEST_NUMBER)
REFERENCES GUEST (GUEST_NUMBER)
);

i am also attaching all the tables ...

thanks and regards ...

You forgot to specify the key in the foreign key declaration:

CONSTRAINT ROOM_NO_FK FOREIGN KEY
REFERENCES ROOM_NO (ROOM_NO),

Should be

CONSTRAINT ROOM_NO_FK FOREIGN KEY (ROOM_NO)
REFERENCES ROOM_NO (ROOM_NO),

thaaaaaaaaaaaaaanx friend ... it works now ...