Issue exporting to .txt when passing Oracle Security parameters in query

I've got a export, that works fine, when run manually.  When I run it via automation, it gives me an error saying that the output file is already in use.  I've seen similar posts here, but can't resolve it for my situation.  

The automation works if I export to Access, but takes 5 times a long, as outputting to a text file.  

I really want to figure out a way to export to txt using the query, can someone help me out?  below are security parameters that I have to add to my query to retrieve data.  I believe the automation is trying to write to the same output for each line, the two security parameters, and the main query.

thanks in advance.

BEGIN mo_global.set_policy_context('S',83); END;
alter session set current_schema=APPS;