Unhandled Exception: PlatformException(channel-error, Unable to establish connection on channel., null, null) - flutter

Question

Suddenly this error appears in the debug console. I do not know what I did wrong.

Answer 1

You've upgraded Flutter but not the packages. In the terminal enter
flutter pub outdated
Then upgrade the outdated packages one by one like this:
flutter pub upgrade outdated_package
After you're finished:
flutter clean
and
flutter pub get
Your problem should now be solved.

Answer 2

I had the same issue and stumped on this post.
In my case I was able to detect which plugin was in fact giving the error and it turned out to be firebase_core. So, I decided to upgrade the package to the latest version which happened to be 1.21.1 in my case.
So, to solve the issue I will suggest you try changing the version of the firebase_core package you're using to the latest in the pubspec.yaml file of your project like so:
firebase_core: ^1.21.1 (replace with latest verison)
Or you can just run:
flutter pub upgrade firebase_core
This will upgrade firebase_core to the latest version.
Or you can as well put any as the version code in the pubspec.yaml file of your project like so:
firebase_core: any (upgrades firebase_core to the latest verison)

Answer 3

Please also check the compileSdkVersion in android/app/build.gradle and update it to 33

Answer 4

You are good to go with these three steps,
Flutter clean
Flutter pub get
Flutter run

Answer 5

If you are using these dependecies then replace it with a latest version:
firebase_messaging
firebase_core
flutter_local_notifications
Then in android/app/build.gradle update compileSdkVersion flutter.compileSdkVersion to 33

Answer 6

I spent a long time looking into this and eventually traced it to the plugin registrar being nil when setting up the plugin.
This was caused by setting my iOS app root view controller to anything other than FlutterViewController (i.e. in my case, I had a UINavigationController as the root). This will result in a failure to register all your plugins.
The app delegate assumes that the root view controller is a FlutterViewController, so if it isn't then you will need to re-direct all plugin-related function calls to your FlutterViewController from your app delegate by overriding these functions as follows:
override func registrar(forPlugin pluginKey: String) -> FlutterPluginRegistrar? {
flutterViewController.registrar(forPlugin: pluginKey)
}
override func hasPlugin(_ pluginKey: String) -> Bool {
flutterViewController.hasPlugin(pluginKey)
}
override func valuePublished(byPlugin pluginKey: String) -> NSObject? {
flutterViewController.valuePublished(byPlugin: pluginKey)
}

Answer 7

I was have this problem.
after downgrade awesome_notifications package to 0.6.21, resolved this.

Answer 8

I also effected from that issue for few hours, finally I found issue that was I ran my emulator as windows (:, yeah please run with Android emulator you selected vm.

Answer 9

for me my dependencies were up to date but I was using windows as an emulator so I switched to android emulator issue was resolved.