UNIX Oracle 10g can use UTL

oracle|unix| Data can unix Oracle 10g read file data with Utl_file packets?
I am under Window Oracle 8i using Utl_file can read the data of text files, I test through,
But not on Unix Oracle 10g! Error!
Begin Loadfiledata (' D:\ora ', ' 1.txt '); End

ORA-29280: Invalid directory path
ORA-06512: In the SYS. Utl_file ", line 33
ORA-06512: In the SYS. Utl_file ", line 436
ORA-06512: In "Wty." Loadfiledata ", line 20
ORA-06512: On line 1
=====================
My stored procedure is loadfiledata:
Create or Replace procedure Loadfiledata (P_path varchar2,p_filename varchar2) is

V_filehandle Utl_file.file_type; --Define a file handle
V_text varchar2 (100); --Storing text
V_name Test.name%type;
V_ID Test.autoid%type;
V_firstlocation number;
V_secondlocation number;
v_totalinserted number;
Begin
if (P_path is null or p_filename is null) then
Goto To_end;
End If;
v_totalinserted:=0;
/*open specified file*/
V_filehandle:=utl_file.fopen (P_path,p_filename, ' R '); ----Open the file and read the data
Loop
Begin
Utl_file.get_line (V_filehandle,v_text);
exception
When No_data_found Then
Exit
End;
V_firstlocation:=instr (V_text, ', ', 1,1);---text file the first ', ' position
V_id:=substr (v_text,1,v_firstlocation-1);---intercept the text file before the first ', ' before the string.
V_name:=substr (v_text,v_firstlocation+1);
/* Insert Database Operation * *
Begin
INSERT INTO Test
Values (v_id,v_name);
If Sql%rowcount=0 Then
Rollback
Else
Commit
End If;
exception
When others then
Rollback
End
End Loop;
<<to_end>>
Utl_file.fclose (V_filehandle);
Null

End Loadfiledata;
===========
The Loadfiledata stored procedure works fine in window Oralce 8I, but why not on Unix ORACLE 1OG
is not a change in the UNIX ORACLE 1OG utl_file package!
Everybody help!
My personal website http://www.kao99.com