Plugin SVN tag does not exist

Hello,

Plugin link

Getting this error.
The Stable Tag field is invalid, the specified SVN tag /tags/2.7.8/ does not exist. /trunk/ will be used instead.
https://i.imgur.com/Ol01TID.png

Tag does exist, see here

Could anyone tell, what’s wrong?

Thanks!

The page I need help with: [log in to see the link]