[Typo3] problem with extension vcd_archive

[Felix Natter]

hi,

when I try to create an archive entry, I get this error:
1: Copying file '/VHOST/t3dummy/fileadmin/user_upload/Downloads/webserver_restore.pdf' failed!: No destination file () possible!. (tx_vcdarchive_entries:NEW42e8b811542af:file)

I am using the default settings.
Do you have some hints on how I could debug this?

thanks,

-- 
Felix Natter