在将操作系统更新为Catalina v10.15.7和Xcode v12.0.1之后，我遇到了同样的问题.我使用终端通过 pod install 删除了 .xcworkspace 并创建了新的 .xcworkspace .

I was facing the same issue after updated OS to Catalina v10.15.7 and Xcode v12.0.1. I deleted .xcworkspace and created new .xcworkspace by pod install using terminal.