Dear Tom,
very Good day to you.
I am trying to use expdp/impdp utility to backup tables,schema etc and it is not executing successfully.
The followings are what I am getting in regard to errors

ORA-39002: invalid operation
ORA-39070: Unable to open the log file.
ORA-29283: invalid file operation
ORA-06512: at "SYS.UTL_FILE", line 536
ORA-29283: invalid file operation

1-I have already created the directory and it does exist.
select directory_name from dba_directories;
2-I have the privilege to read and write on it.

select * from dba_tab_privs;

I guess there problem with log and dump files that cannot be opened.
3-When I execute the syntax I run it as admin
4-If if you will give me instructions to solve the problem please make sure to instruct me to execute the commands or syntax on sqlplus or cmd prompt.
Awaiting your earliest reply.
Many many thanks Tom for your help.
Dawood

declare
  f utl_file.file_type;
begin
  f := utl_file.fopen ('<your directory>', 'test.txt', 'w');
  utl_file.put_line(f, 'test');
  utl_file.fclose(f);
end;
/

expdp ... logfile=export_dir:exp.log