ORA-06510: PL/SQL: unhandled user-defined exception

Bonjour,
mon script est :

Code:

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SET SERVEROUT ON
DECLARE
 vInHandle utl_file.file_type;
 vNewLine  VARCHAR2(250);
 vMessage  VARCHAR2(250);
I pls_integer := 0;
LC$Fic_in Varchar2(128) := 'monALRT.LOG'; -- a adapter sur votre configuration
LC$Dir_in Varchar(30) := 'U:\ORADATA\MABASE\bdump'; 
 
BEGIN
 
  vInHandle := utl_file.fopen(LC$Dir_in, LC$Fic_in, 'R');
  LOOP
 
    BEGIN
      utl_file.get_line(vInHandle, vNewLine);
      IF vNewLine like ('%ORA-%') then      
      vMessage:=vMessage||chr(10)||vNewLine;
 
 
      END IF;
    EXCEPTION
      WHEN OTHERS THEN
        EXIT;
    END;
  END LOOP;
DBMS_OUTPUT.ENABLE(10000);
      DBMS_OUTPUT.PUT_LINE(vMessage);
 
  utl_file.fclose(vInHandle);
END fopen;
/

et l'erreur est :

Code:

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DECLARE
*
ERROR at line 1:
ORA-06510: PL/SQL: unhandled user-defined exception
ORA-06512: at "SYS.UTL_FILE", line 98
ORA-06512: at "SYS.UTL_FILE", line 157
ORA-06512: at line 11

or la ligne 98 dans utlfile.sql est :

Code:

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97   ** IN
     98   **   file - File handle (open)
     99   ** EXCEPTIONS
    100   **   invalid_filehandle - not a valid file handle
    101   **   write_error        - OS error occured during write operation
    102   */

et la ligne 157 :

Code:

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 154   ** NEW_LINE - Write line terminators to file
    155   **
    156   ** IN
    157   **   file - File handle (open in write/append mode)
    158   **   lines - Number of newlines to write (default 1)
    159   ** EXCEPTIONS
    160   **   invalid_filehandle - not a valid file handle
    161   **   invalid_operation  - file is not open for writing/appending
    162   **   write_error        - OS error occured during write operation
    163   */

Mais je ne veux que lire le fichier; alors pourquoi cette erreur ? Pouvez-vous m'aider ?
D'avance merci.