我取消勾选，然后勾选“自动管理签名”选项。这为我解决了问题。

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

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。

我有我撤销的证书的剩余私钥，证书没有了，但私钥没有。删除它们就解决了问题。

要找到他们:

打开钥匙串访问 点击左侧菜单类别下的“键” 寻找未绑定证书的iOS Developer:…"密钥 我删除了它们，问题就解决了

图中高亮显示的密钥是一个没有证书的样例私钥。

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”。

以下是为我解决的步骤(对于那些在XCode 9.2中面临相同问题的人):

刚刚手动删除了~/Library/MobileDevice/Provisioning profiles中的本地配置文件。 删除并创建了开发人员帐户中的所有证书和配置配置文件。 从Xcode中删除了开发者帐户，并重新添加了它。

解决了我的问题!: -)