database is locked Possibly there are two concurrent builds running in the same

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报错：

unable to attach DB: error: accessing build database "/Users/***/Library/Developer/Xcode/DerivedData/Unity-iPhone-djjeuoddrkwudghjcktckehdiqla/Build/Intermediates.noindex/XCBuildData/build.db": database is locked Possibly there are two concurrent builds running in the same filesystem location.

原因：一个项目在两个xcode启动同时build

解决：退出报错的xcode