It seems that after the build phases, a executable of the server is not present.
I am using swift-package-manager.
Xcode version: Version 13.2 (13C90)
System spec:
macOS Big Sur Version 11.6.1 (20G224)
Mac mini (M1, 2020)
Chip Apple M1
Memory 16 GB
https://github.com/UrbanCompass/Mussel#swift-package-manager