sql+ issues

SQL> create table accountmanager
2 ( amid char(4),
3 amfirst varchar(12),
4 amlast varchar(12),
5 amdate DATE DEFAULT SYSDATE,
6 amsal NUMBERS(8,2),
7 amcomm NUMBERS(7,2) DEFUALT 0,
8 amern AS (amsal + amcomm),
9 region char(2) );
amsal NUMBERS(8,2),
*
ERROR at line 6:
ORA-00907: missing right parenthesis
what am i doing wrong