foreign key problem

if someone can help me in this now
I have an error , i want to make a foreign key but it is not working

SQL> create table violation (violation_no number(5) constraint violation_no primary key,
2 violation_type varchar2(20), place_of_violation varchar2(10),
3 date_of_violation date, violation_status varchar2(10), license_no number(7) constraint license_
no foreign key, vehicle_no number(15) constraint vehicle_no foreign key, money_to_pay number(5));
date_of_violation date, violation_status varchar2(10), license_no number(7) constraint license_no fo
*
ERROR at line 3:
ORA-02253: constraint specification not allowed here

You need to specify what each column references table(column)

I would recommend taking out all of the FK pieces in your table create syntax and go back in and manually adding them.

ALTER TABLE table name ADD CONSTRAINT FK_constraint_name foreign key(column_name)
references other table(column_name);