还要确保在模拟器中启用了wifi

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.)

从设备上删除应用程序，然后重新安装

所有那些关于改变版本以适应我的错误的答案。

这个错误没有告诉您这个版本来自哪里。在所有文件中搜索，我发现只有1个地方定义了javascript版本: 问题是这个包(\android\app\src\main\assets\index.android.bundle)需要重新生成，因为它包含的版本比安装的包要旧。

为了重新生成该文件，我必须运行以下命令:

react-native bundle --platform android --entry-file index.js --bundle-output android/app/src/main/assets/index.android.bundle --assets-dest android/app/src/main/res

因为我已经升级了我的react-native，所以运行这个命令给了我一些需要解决的错误(主要是安装新的依赖项)。

清理缓存，在android studio中重新加载，重新加载react，重新加载终端，创建一个新项目并传输文件，运行watchman，所有这些都不能工作，因为特定的bundle文件恰好在Git repo中被跟踪。

我们所做的修正是确保在构建之前设置ANDROID_HOME和PATH变量。

首先，运行以下两个命令，然后为设备构建应用程序。

export ANDROID_HOME=/Users/username/MyFiles/applications/androidsdk
export PATH=$PATH:$ANDROID_HOME/tools:$ANDROID_HOME/platform-tools

博览会用户-确保您的app.json sdk版本和包。Json的博览会版本是(可能相等)彼此兼容。