Insert XMLTYPE in Oracle 9i

How should I insert XMLTYPE data in Oracle9i.

I used the following insert statement in Oracle 9i in Unix OS

INSERT INTO str_dta
VALUES (3569,405,0,XMLTYPE('<ASE>50</ASE>'));

I got the following error

ORA-31011: XML parsing failed
ORA-06512: at "SYS.XMLTYPE", line 0
ORA-06512: at line 1

Can anyone help me know how to insert records in SQLPLUS using insert statements for records of the above type.

Structure of str_dta is
SNo number(5)
EmpNo number(4)
Status number(1)
Details SYS.XMLTYPE

Should I set any environment variable before doing the above insert?

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