Error type 3. Activity class {com.awesome_project/ com.awesome_project.MainActivity} does not exist in react native (Android device)

Question

I\'ve created the project using the following command.

react-native init Awesome_Project

I\'ve started the packager using the following com

Answer 1

I had changed my application id from com.appName to com.companyName.appName, and I had made this update in android>app>build.gradle:

defaultConfig {
  applicationId "com.companyName.appName" // was previously "com.appName"
}

I also changed my file structure from android>app>src>main>java>com>appName to android>app>src>main>java>com>companyName>appName. This is when I got the error.

To fix the error, I simply did a project wide search (CMD-SHIFT-F in Atom) for com.appName, and replaced them all with com.companyName.appName. Problem solved!