What am I doing wrong (RTRIM, PL/SQL)

Oracle 8.0.5
I cannot find an example for what I am trying to do - I want to parse a string using rtrim but am having trouble. Here is a sample of what I am trying to do:

declare col1 varchar2(10);
begin
col1:=rtrim('1111,2222,3333,4444',','); DBMS_OUTPUT.PUT_LINE(col1);
end;

These are the messages I get:

ORA-06502: PL/SQL: numeric or value error ORA-06512: at line 3

What am I doing wrong? - I've tried declaring col1 as a char(10), also I've tried selecting into it, but nothing seems to work. Received on Tue Sep 28 1999 - 11:20:18 CDT