[Plugin: Static Feed] Feed not working

Hi there,
yesterday I had to do a test on my blog and I deactivated the plugin. After a few minutes I reactivated it, but since then my feeds don’t work.
The error feedvalidator gives me is XML parsing error: <unknown>:1:0: no element found
I tried to reupload all feeds files, but nothing changed.

The feeds are:

https://www.milannight.com/feed
https://www.milannight.com/atom.xml
https://www.milannight.com/rss.xml
https://www.milannight.com/rdf.xml
https://www.milannight.com/rss2.xml

How can I solve the issue?

Thanks.

https://www.ads-software.com/extend/plugins/staticfeed/