PL/SQL: numeric or value error: character string buffer too small

Hey when i am running my application in the specific module i am getting this error as below:-
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Error Type:
GNSBillboard_BS.BillboardBS.Save_Billboard_Instance() (0xFFFFE69A)
ORA-06502: PL/SQL: numeric or value error: character string buffer too small
/gns/scripts/Utility/Billboard.asp, line 108


Browser Type:
Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)

Page:
POST 188 bytes to /gns/scripts/Utility/Billboard.asp

POST Data:
txtBillboardTitle=test&txtBillboardLine1=+%3Ca+href%3D%27www.test.com%27+target%3D%27_top%27%3Etest%3C%2Fa%3E&checkbox1=on&txtBillboardLine2=&txtBillboardLine3=&txtBillboardStatus=A&mode=C

Time:
Wednesday, July 23, 2008, 6:01:09 PM
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For your ref. enclosed the .doc which explains the error with another text file with table name and related procedure..
kindly anybody provide solns..
thx in adv..............
- KC-Ram..

billboard-error.doc
proc-tablename.txt