android/app/build。Gradle和search for

 buildTypes {
     ....
 }

你可能会有

buildTypes {
    debug {
        ...
    }
    release {
        ...
    }
    customBuildType {
        ...
    }
}

选择你想要启动的buildType，然后启动应用程序如下

react-native run-android --variant=[buildType] --appIdSuffix '[buildType]'

So,

react-native run-android --variant=debug --appIdSuffix 'debug'

当我在模拟器中切换到客户配置文件时，我也收到了同样的错误消息。我切换回所有者配置文件，它工作了。

有时候，重命名项目的根目录就会发生这种情况，只需要删除项目的。idea文件夹，然后用Android Studio重新打开它。

在“android/app/src/main/AndroidManifest.xml”目录中查看以下内容

<application
      android:name="[your_package_name].MainApplication"
   ...>
    <activity
        android:name="[your_package_name].MainActivity"
       ...>   

Had the same error, with a much newer version of Android Studio (version 4.1) . A fresh install of Android Studio + a fresh "basic Activity" template would run into error type 3 for hours. I am on win 10 - my problem was how to kill the gradle cache. A good answer above showed a screen snapshot from gradle, but i didn't find it in Android Studio 4.1. Also the env vars for gradle had not been set , and the commandline for gradle didn't work. So .. here is how it worked finally. I went to C:\Users\myusername\ .gradle. This has subdir "caches". I deleted everything inside. Worked ! I did close Android Studio before, restarted and then it worked nicely. Ah forgot one thing- i run the device emulator (defauöt device), i.e. no physical device yet.

在我的例子中，我实际上改变了包的名称，它开始导致这个问题。

我尝试过很多方法，但在这里我只描述对我有效的方法。

删除你的构建文件夹，它也包括清洁(所以不需要清洁它) 尝试重新启动android工作室，如果这没有工作，然后使缓存无效。 如果它仍然给你错误，然后尝试清除模拟器的数据，希望这将解决问题，

确保您的活动名称是正确的，也确保包名称是正确的清单文件。