PLS-00553: character set name is not recognized

Bonjour,
voici mon script :

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SET SERVEROUT ON
DECLARE
 vInHandle utl_file.file_type;
 vNewLine  VARCHAR2(250);
I pls_integer := 0;
LC$Fic_in Varchar2(128) := 'db1ALRT.LOG'; -- a adapter sur votre configuration
LC$Dir_in Varchar(30) := 'C:\oracle\admin\db1\bdump'; 
 
BEGIN
 
  vInHandle := utl_file.fopen(LC$Dir_in, LC$Fic_in, 'R');
  LOOP
I:=i+1;
If I=5 then
EXIT;
END if;
    BEGIN
      utl_file.get_line(vInHandle, vNewLine);
      DBMS_OUTPUT.ENABLE(10000);
      DBMS_OUTPUT.PUT_LINE(vNewLine);
    EXCEPTION
      WHEN OTHERS THEN
        EXIT;
    END;
  END LOOP;
 
  utl_file.fclose(vInHandle);
END fopen;
/

cela donne l'erreur :

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Input truncated to 1 characters
ERROR:
ORA-06550: line 1, column 29:
PLS-00553: character set name is not recognized
ORA-06550: line 0, column 0:
PL/SQL: Compilation unit analysis terminated

Avez-vous une idée ?
D'avance merci.
PS :

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SQL> show parameter NLS
 
NAME                                 TYPE    VALUE
------------------------------------ ------- ------------------------------
nls_language                         string  AMERICAN