Same here, On a top of all other previously mentioned tricks I also tried to delete ~/Library/Caches/org.swift.swiftpm as well, but nothing happens.
It starts happening when I switch to different branch in git and only way to make it work is to reinstall Xcode.
mmiroslav
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I found solution! It seam that SourceTree update introduce new line in .gitconfig file so getting rid if it makes this problem disappear:
https://jira.atlassian.com/browse/SRCTREE-8176
Just delete
[safe]
bareRepository = explicit
from ~/.gitconfig And SMP will start working again!