Flutter url_launcher not working MissingPluginException

i want to launch google map when tap on button, nothing complicated. i found easy code also from google search. Pasting the code below for reference. i dont know it is the proper way to do.

  class MapUtils {
    MapUtils._();

    static Future<void> openMap(double latitude, double longitude) async {
      String googleUrl =
          'https://www.google.com/maps/search/?api=1&query=$latitude,$longitude';
      if (await canLaunch(googleUrl)) {
        await launch(googleUrl);
      } else {
        throw 'Could not open the map.';
      }
    }
  }

pubspec.yaml added -> url_launcher: ^6.0.17

i called this -> MapUtils.openMap(-33.2445107, 9.1530103)

Whenever i tap on the button return error as "Unhandled Exception: MissingPluginException(No implementation found for method launch on channel plugins.flutter.io/url_launcher)"

i tried to find solution, what i tried is Flutter clean, flutter pub get. Close everything reopen uninstall app from emulator device. close emulator and restart. total computer restart. it is nothing related url_launcher still i add the google map api to androidmanifest and appdelegate. Enables Api. Lot of popel are asking about the same error. May be i am missing something todo.