[swift-users] "swift build" throws <unknown>:0: error: no such file or directory: 'build'

[Joy Mailer]

Followed the instructions on this page to set up a Package:
https://swift.org/getting-started/#using-the-build-system

When I run "swift build", I get the error:
<unknown>:0: error: no such file or directory: 'build'

I'm able to build stand alone files with "swiftc myprogram.swift"

JJ
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