Thanks for the reply, Debbie.
I use my accout as an administrator to schedule the automation.
What I don't understand is the file it can't find is not referenced anywhere in the script. Nor is it the list being exported to. Where could it be picking up that file?
I am exporting to a list, (99. Costplan Activity), and the file it can't find, ('M:\East\05. Respite Cost Plans Per person'), is an Excel document in another section of the SharePoint Site.
I can run all of the automation scripts directly from TDP with no issues. It's only when I try to schedule them that I have problems.