我试图从WebStorm中构建和运行一个React Native应用程序，然后遇到了这个问题。对我来说，简单的解决方案是:

watchman watch-del-all

在macOS上，如果watchman还没有安装，请使用Homebrew安装:

brew install watchman

在我的情况下(不使用博览会和Android构建)

package.json

"dependencies": {
    "react": "16.3.1",
    "react-native": "0.55.2"
}

和app.json

{
  "sdkVersion": "27"
}

解决问题

I've never seen this error before, but whenever I can't get Xcode and React-Native to play well together, I do a couple of things. Check what version of Xcode I'm working with. If it needs to be updated, I update it. Then clearing watchman and the cache are the second place I go. I don't use the reset cache command. It always says that I need to verify the cache, so I skip that (you can do it though, I just get confused). I use rm -rf $TMPDIR/react-* to get rid of any cached builds. If that doesn't work, I try to build the app in Xcode, then work my way from there, to build it with react-native run-ios. With this error message, it seems you might start by trying to build it with Xcode. Hope that helps...let me know your progress with it. Good luck! (Also, you could update to RN 0.51 as another attempt to get your versions synced.)

我从stackoverflow找到了另一个问题的答案，我喜欢把它放在这里。

第一步:我改变了expo在package中的值。Json文件到最新支持的版本，根据博览会文档(访问这里)。

第二步:我将app.json文件中的sdkVersion的值更改为package.json中expo的值。(与上一步数量相等)。

如果sdkVersion在你的app.json文件中不存在，请像这样添加。 :“sdkVersion xx.x。X”(与package.json中的expo版本相同)

第三步:我在包中改变了react-native的值。根据expo文档(请访问这里)，将json文件更改为与React Native Version相同的值。

Opene管理扫描/ android / app / build.gradle

试一试:

编译("com.facebook.react:react-native:0.51.0") {force = true}

而不是 编译"com.facebook.react:react-native:0.51.0" {force = true}

裁判:链接

在手动更新我的包后，我就遇到了这个问题。 从Expo Go应用程序中删除所有项目并运行Expo update自动为我解决了这个问题。