Ora 6502 error in forms

hi all,
in created a insert form ,where in i have over ridden the 'when-button pressed' trigger.
when the button is pressed all the data from the form is entered into the database.
I am succeding in transferring the data into the database but ...' get an error message
unhandled exception ora 6502'.....
I have provided the max size to the database column account and cust_no column.
below is my code in the 'when button-pressed trigger'
insert into customer
CUSTNO ,
ACCNO --,
--CUST_ADD1 ,
--CUST_ADD2 ,
--CUST_POSTCODE
values
:CUSTNO ,
:ACCNO -- ,
--:CUST_ADD1 ,
--:CUST_ADD2 ,
--:CUST_POSTCODE
commit_form;
exit_form('NO_VALIDATE');
also my customer table is like below
SQL> desc customer;
Name Null? Type
CUSTNO NUMBER(38)
ACCNO NUMBER(38)
CUST_ADD1 VARCHAR2(200)
CUST_ADD2 VARCHAR2(200)
CUST_POSTCODE VARCHAR2(50)
please let me know ...
rgds
s

ORA-6502: PL/SQL: numeric or value error
there are many problems, which raise this error
string vs date vs number - problem. Check your datatypes
strings which are too long - check the size of the inserted data and the length of the columns
what did you find ?

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First off all, I am not very good in PL/SQL so please bear with me:
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END IF;
END IF;
END;
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Ora 6502 error in forms

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