carthage更新不起作用任务失败，退出代码为65：

Question

我尝试在xcode 8.3.1上使用carthage update来添加octokit，但是当我执行命令carthage update时，终端显示此错误：

Build Failed
    Task failed with exit code 65:
    /usr/bin/xcrun xcodebuild -project /Users/xuliner/Downloads/octokit.objc-54474a6947342ddedb4f3dc37ca6e54c050d92bf/Carthage/Checkouts/Nimble/Nimble.xcodeproj -scheme Nimble-iOS -configuration Release -derivedDataPath /Users/xuliner/Library/Caches/org.carthage.CarthageKit/DerivedData/Nimble/v3.2.0 -sdk iphoneos ONLY_ACTIVE_ARCH=NO CODE_SIGNING_REQUIRED=NO CODE_SIGN_IDENTITY= CARTHAGE=YES clean build

This usually indicates that project itself failed to compile. Please check the xcodebuild log for more details: /var/folders/vn/c9ppdjg12rn8pj5r093g8_tr0000gn/T/carthage-xcodebuild.qEGXw6.log

我打开构建日志，它显示：

** BUILD FAILED **


The following build commands failed:
    Check dependencies
(1 failure)

我该如何解决？