Multiple commands produce

Multiple commands produce これが出ましたら

概要

ビルドを行おうとしたらこんなエラーが出ました。

// Multiple commands produce '/Users/yamadatakayuki/Library/Developer/Xcode/DerivedData/sevens-fmjcmstkdwmtzkeutizzbaxfjoff/Build/Products/Debug-iphonesimulator/sevens.app/README.md':
//1) Target 'sevens' (project 'sevens') has copy command from '/Users/yamadatakayuki/code/github/sevens/sevens/Reducer/LibraryDesutte/README.md' to '/Users/yamadatakayuki/Library/Developer/Xcode/DerivedData/sevens-fmjcmstkdwmtzkeutizzbaxfjoff/Build/Products/Debug-iphonesimulator/sevens.app/README.md'
//2) Target 'sevens' (project 'sevens') has copy command from '/Users/yamadatakayuki/code/github/sevens/sevens/UIKit/NankanoLibrary/README.md' to '/Users/yamadatakayuki/Library/Developer/Xcode/DerivedData/sevens-fmjcmstkdwmtzkeutizzbaxfjoff/Build/Products/Debug-iphonesimulator/sevens.app/README.md'
//3) Target 'sevens' (project 'sevens') has copy command from '/Users/yamadatakayuki/code/github/sevens/sevens/UIKit/SAConfettiView/README.md' to '/Users/yamadatakayuki/Library/Developer/Xcode/DerivedData/sevens-fmjcmstkdwmtzkeutizzbaxfjoff/Build/Products/Debug-iphonesimulator/sevens.app/README.md'

これが出たら同じファイルをビルドに含めないで〜

的な理由なので、ビルドから外すとビルドできます。