Please help me : SUBSTR function in Oracle 6i

Question

Dear all people!
I have a problem with SUBSTR as follow:
my code:
declare
string1 varchar2(300);
string2 varchar2(65);
begin
string1 := ....
string2 := substr(string1,1,60);
end;
when i run program in debug
at command "string2 := substr(string1,1,60);" it raise error ORA-06502;
Please tell me how to assign substr(string1,1,60) to string2 (max length of string2 is 65);
I'm looking to forward to receiving your response!
Thank you very much;

Answer 1

The question was simple:
I am trying to do is bring in anything after the * in the Id column no matter how long the name is before the * but my calculation is way off L:
Here is an example of what my data would look like but what I need it to do:
Id                                                        NEW COLUMN
TNET*231333                                  231333
AMER*29283893.2                       29283893.2
TNEY*21893838                             21893838
Do you know how to create this calculation?
Answer: SUBSTR(id,INSTR(id,'*',1)+1,999)
this was emailed to me from someone on here saying "try to see if this helps" and it did that's why i said thank you.