Xcode 11 Package.resolved is out of date

I created a Swift package and pushed it to GitHub. But when I'm trying to add it as a dependency to my other project I get

"the Package.resolved file is most likely severely out-of-date and is preventing correct resolution; delete the resolved file and try again"

I found the file mentioned and deleted it, but it didn't reolve the issue.

Xcode 11 beta 3, no other packages in the project.