(No implementation found for method canLaunch on channel plugins.flutter.io…)

Solution for (No implementation found for method canLaunch on channel plugins.flutter.io…)
is Given Below:

enter image description hereenter image description hereI am building an application that uses firebase and share the content of the application
The app was working fine and when I added the firebase packages I got errors:

MissingPluginException(No implementation found for method canLaunch on channel plugins.flutter.io/url_launcher)

MissingPluginException(No implementation found for method canLaunch on channel plugins.flutter.io/share)

MissingPluginException(No implementation found for method canLaunch on channel plugins.flutter.io/google_mobile_ads)

I have tried more than one method
(flutter clean) many times
(flutter pub get) many times
(flutter run)
(reinstall app) many times
I searched for solutions but it didn’t work

class Home extends StatefulWidget {
static String id = 'HomeScreen';
const Home({Key? key}) : super(key: key);

@override
_HomeScreenState createState() => _HomeScreenState();
 }

class _HomeScreenState extends State<Home> {

Future<InitializationStatus> _initGoogleMobileAds() {
return MobileAds.instance.initialize();
}


 late BannerAd _bannerAd;

 bool _isBannerAdReady = false;

  @override
  void initState() {
 _bannerAd = BannerAd(
  adUnitId: AdHelper.bannerAdUnitId,
  request: AdRequest(),
  size: AdSize.banner,
  listener: BannerAdListener(
    onAdLoaded: (_) {
    setState(() {
      _isBannerAdReady = true;
    });
    },
    onAdFailedToLoad: (ad, err) {
     print('Failed to load a banner ad: ${err.message}');
     _isBannerAdReady = false;
      ad.dispose();
    },
  ),
 );

 _bannerAd.load();
 enter image description here}


 @override
 void dispose() {
  _bannerAd.dispose();
  super.dispose();
 }}

I added ads in same class that has _launchUrl()

    _launchURL() async {
    const url="url";
    if (await canLaunch(url)) {
    await launch(url);
    } else {
  throw 'Could not launch $url';
   }
  }

and _share() method also

         onTap: () {
           Share.share(appUrl);
              },

I got the answer
I was using the flutter_facebook_auth package: when read doc enter link description here

When you install this plugin you need to configure the plugin on Android before run the project again . If you don’t do it you will have a No implementation found error because the facebook SDK on Android throws an Exception when the configuration is not defined yet and this locks the other plugins in your project. If you don’t need the plugin yet please remove or comment it.