@theobouwman Check whether the following values are same,

• package (usually line 2) in /android/app/src/main/AndroidManifest.xml

• applicationId (usually line 90) in defaultConfig section of /android/app/build.gradle

• Line 1 of /android/app/src/main/java/com/paysack/MainApplication.java

• Line 1 of /android/app/src/main/java/com/paysack/MainActivity.java

It looks like the repro steps require adding several other libraries. I wonder if you can provide a minimal repro that shows this is indeed an issue in RN?

@hramos the Auth0 library requires the MainActivity to have the launchMode as singleTask. Could that be the cause of this bug?

@theobouwman try adding the following to android/settings.gradle

include ':app'

Mine was missing that line because I was messing around. I assume that means that gradle skips compiling the actual app and just compiles 3rd party stuff eg

rootProject.name = 'AppName'

include ':react-native-vector-icons'
project(':react-native-vector-icons').projectDir = new File(rootProject.projectDir, '../node_modules/react-native-vector-icons/android')
include ':react-native-navigation'
project(':react-native-navigation').projectDir = new File(rootProject.projectDir, '../node_modules/react-native-navigation/android/app')
include ':app'

@thevolcanomanishere saved my life! I've removed that line (include ':app') by accident, when removing some duplicated entries of plugins.

I got the same error when adding mutiple build variants to app/build.gradle with different applicationIdSuffix's. According to this unmerged PR, it seems to be a well known RN problem :(

@jenskuhrjorgensen Thanks that's what caused this error for me.

I was using CodePush and had several buildTypes (releaseStaging) defined in android/app/build.gradle.

After restoring it to just debug and release, it works again

@MrToph FYI I'm still using different buildTypes with applicationIdSuffix, but I run my Android app using e.g. ./gradlew installStagingDebug or ./gradlew installStagingRelease from within the android folder.

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I had the same issues and it turned out that the cause was a previously installed app with the same name that wasn't properly uninstalled.

https://medium.com/@thehenrytsai/react-native-troubleshooting-history-c876adda2d67

I had the same issues and none of the above fixes worked for me. Here's what did:

• Check your android files (Settings.gradle, app/build.gradle, and MainApplication.java) for any duplications. I was playing around with react-native link and a particular package appeared twice and that was messing up my build.

NOTE: The app crashed on opening it. The error in the terminal still persists but the app runs on the device (emulator & physical device)

i am suffering from same issue.please help

Error type 3
Error: Activity class

"react-native": "0.49.3",
"react": "16.0.0-beta.5"

This helped me. You may have deleted/uninstalled your app, but when you check in your settings/apps, you can see that it's not totally uninstalled.

Go to Settings.
Go to Apps.
Select your app. (here, you can verify that your app is not uninstalled properly).
Open the overflow menu on the top right and select Uninstall for all users.
Done. Try to install then launch your app again.

Having the same problem here

Yes I uninstalled my react-native app on my Android phone and was met with this error. I followed @miakachammy's steps and re-ran react-native run-android and things worked as expected! I guess the launcher doesn't uninstall apps for all users when you drag it to uninstall?? ¯\_(ツ)_/¯

I was having the same issues and none of the above solutions fixed it and cd android && ./gradlew clean was doing nothing for me.
This worked though: cd android && ./gradlew installReactnativeDebug.
And this seems to work too: react-native run-android --variant=reactnativeDebug. Apparently, indicating the version solves the issue.

My project has multiple build types where each build type specifies applicationIdSuffix in build.gradle. I was able to get mine working by specifying the appIdSuffix argument e.g.

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

Not sure why it doesn't just honor the applicationIdSuffix defined in the variant?