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.)

对于我的情况下，我在iOS上面临它，我试图重置和清除所有缓存使用以下命令，但失败了，尽管许多评论说，根本原因是有react打包器在某处意外运行，我重新启动了我的mac，问题仍然存在。

watchman watch-del-all && rm -rf node_modules/ && yarn cache clean && yarn install && yarn start --reset-cache

解决方案是，删除build文件夹@ /ios/build，然后执行react-native run-ios解决了它

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

我有同样的问题，而建立我的react原生应用程序的android和我做了以下工作。

错误控制台中“JavaScript版本0.50.1”是包中的react-native版本。json文件。确保它与错误控制台中“本机版本0.50.0”的版本相同。

我已经在错误控制台中按照提示将react-native版本更新为“Native version 0.50.0”。 重新构建应用react-native run-android。

尝试重新安装依赖项。这对我很管用

1.) yarn/npm install 2) yarn/npm start——reset-cache

在你的android应用级别的gradle文件中，在依赖项中强制react原生版本。

compile ("com.facebook.react:react-native:0.52.0") { force = true }

为我工作