Storing Large Volume File In CLOB Column As A String?

I am having problem in inserting a long file (80000 B) into CLOB cloumn in oracle database 10g.

ERROR at line 23:
ORA-06550: line 23, column 1:
PLS-00172: string literal too long

I am calling the oracle stored procedure through unix shell script as fallows.

#!/bin/ksh
cd /usr/home/dfusr/backup
i=`cat pe_proxy_master_2160.Thu.log | sed "s/'/''/g"`
sqlplus username/password@db 1> temp.log <<!
DECLARE
BEGIN
Write_Text_To_CLOB(1,'$i');
COMMIT;
END;
/

The file pe_proxy_master_2160.Thu.log is about 50000 B.

My Stored Procedure is fallows

CREATE OR REPLACE PROCEDURE Write_Text_To_CLOB (
p_id IN NUMBER
, p_clob IN VARCHAR2
)
IS

[code]....

I also tried with ojdbc5.jar and ojdbc14.jar files in class path.