AutoPilot and X and no user logged in

I have a server to run several reports on certain times.
The reports are planned using the Jet Scheduler and run as planned even when the user that made them is not logged on to the server.
This knowledge base article was a big help to get it up and running.

But….
Now I want to schedule a report that creates a batch file to run the same report with several different parameters.
That is not happening.
The log states that "No documents can be opened or saved by Excel anymore, because there insufficient memory or diskspace. Close worksheets to make more memory available or remove files you don't use anymore from the disk you want to use."
When I am logged in as the user that created the report, everything runs fine.

What do I miss?
Or is the /X option not available for AutoPilot when logged off?

To be sure, this is the setup:
Server: Windows Server 2012 R2 - 64bit
Excel: Office 2013 - 32 bit
Jet: Essentials 2013 Update 1 - 32 bit
AutoPilot instruction: /M "Values" /I "\\file-server\Administratie\JetReports\Sharepoint\JetAutoPilot\ResourceList.xlsx" /O "\\file-server\Administratie\JetReports\Sharepoint\JetAutoPilot\Uitvoer\ResourceList.xlsx" /L "\\file-server\Administratie\JetReports\Sharepoint\JetAutoPilot\Uitvoer\Declarabiliteit.txt" /X "BatchBereik"

rmw