/Library/Developer/Toolchains/swift-DEVELOPMENT-SNAPSHOT-2016-02-08-a.xctoolchain/usr/bin/swiftc --driver-mode=swift -I /Library/Developer/Toolchains/swift-DEVELOPMENT-SNAPSHOT-2016-02-08-a.xctoolchain/usr/lib/swift/pm -L /Library/Developer/Toolchains/swift-DEVELOPMENT-SNAPSHOT-2016-02-08-a.xctoolchain/usr/lib/swift/pm -lPackageDescription -target x86_64-apple-macosx10.10 /Users/USER/Developer/swiftweb/Clones/SourceKit/Package.swift
swift-build: error: no targets found for this file layout
refer: https://github.com/apple/swift-package-manager/blob/master/Documentation/SourceLayouts.md