在我的情况下，在钥匙串我有两个证书同名，我删除了其中一个证书是重复的，然后它解决了这个问题。

对于那些仍然在Xcode8中与这个问题作斗争的人。对于我来说，这是一个重复的证书问题，这是我解决它的方法:

我读了尼克的回答，然后开始了我的调查。我检查了我的特定案例中的所有密钥和证书(在~/Library/Keychains/System.keychain中)。

When I opened the file, I found that I had two iPhone Distribution Certificates (that was the certificate that Xcode was requesting me), one with the iOS Distribution private key that I have been using since the beginning, and another iPhone Distribution Certificate which its private Key had a name (iOS Distribution:NAME) that wasn´t familiar for me. I deleted this last certificate, started Xcode again and the problem was gone. xCode wasn´t able to resolve that conflict and that´s why it was giving signing certificate error all the time.

检查你的钥匙链，也许你有一个重复的证书。

“启用自动签名”，然后从下拉菜单中选择一个团队，帮助我解决了这个问题。

Delete the developer certificate that does not have a private key. Delete the provisioning profile from your machine using go to folder (~/Library/MobileDevice/Provisioning Profiles) Then first check then uncheck the Automatically manage signing option in the project settings with selecting team. Sing in Apple developer account and edit the provisioning profile selecting all available developer certificates then download and add to XCODE. Select the provisioning profile and code signing identity in project build settings

出现这种情况是因为配置配置文件无法找到它所链接的证书的文件。

修复:

检查哪个证书链接到您的配置配置文件 在Apple Developer仪表板的Certificates, Identifiers & Profiles部分点击编辑你的配置文件 从仪表板下载证书 双击该文件将其安装到您的钥匙链中 将文件拖到Xcode中以确保它是链接的

错误现在应该消失了。

我在最近将Xcode更新到9.3版本后遇到了这个问题 问题是在代码签名(在调试下)证书被设置为分发证书而不是开发证书，所以这阻止了我在我的设备上安装应用程序。

以下是我解决这个问题的方法。

项目->目标->选择你的应用程序->构建设置->代码签名身份->调试->双击“iPhone Distribution”并将其更改为“iPhone Developer”。