Xcode项目：构建失败

我试图构建新项目，但是当我单击构建时，构建每次都会失败。

我尝试删除我的项目并重新创建它，但是无论如何还是没有帮助。

警告

:-1: Capabilities for MyFirstApp may not function correctly because its entitlements use a placeholder team ID. To resolve this, select a development team in the build settings editor. (in target 'MyFirstApp')

错误

~/MyFirstApp/Base.lproj/LaunchScreen.storyboard:-1: Failed to find or create execution context for description '<IBCocoaTouchPlatformToolDescription: 0x7fc3a9a03e10> System content for IBCocoaTouchFramework-ElevenAndLater <IBScaleFactorDeviceTypeDescription: 0x7fc3a9a141a0> scaleFactor=2x'. These intermediate objects were non-nil: (

~/MyFirstApp/Base.lproj/Main.storyboard:-1: Failed to find or create execution context for description '<IBCocoaTouchPlatformToolDescription: 0x7fc982cd0ca0> System content for IBCocoaTouchFramework-ElevenAndLater <IBScaleFactorDeviceTypeDescription: 0x7fc982cb9cd0> scaleFactor=2x'. These intermediate objects were non-nil: (

这些是Xcode向我显示的错误消息。项目名称为“ MyFirstApp”，我在该错误消息上剪切了一些文件路径。那么我如何建立这个项目呢？