MissingPluginException while using plugin for flutter : <p>I am trying to use the plugin </p>

<pre><code>_launchURL(url) async {
  await launch("www.google.com");
}
</code></pre>

<p>I have put "www.google.com" just for debugging purposes.</p>

<p>The error I get is MissingPluginException :</p>

<pre><code>E/flutter ( 8299): MissingPluginException(No implementation found for method launch on channel plugins.flutter.io/url_launcher)
E/flutter ( 8299): #0      MethodChannel.invokeMethod (package:flutter/src/services/platform_channel.dart:278:7)
E/flutter ( 8299): &lt;asynchronous suspension&gt;
E/flutter ( 8299): #1      launch (package:url_launcher/url_launcher.dart:47:19)
E/flutter ( 8299): #2      _launchURL (file:///Users/matejsimunic/Work/dart/suhail/lib/main.dart:834:9)
E/flutter ( 8299): &lt;asynchronous suspension&gt;
E/flutter ( 8299): #3      _TripDetailBodyState.build.&lt;anonymous closure&gt; (file:///Users/matejsimunic/Work/dart/suhail/lib/main.dart:818:19)
E/flutter ( 8299): #4      _InkResponseState._handleTap (package:flutter/src/material/ink_well.dart:494:14)
E/flutter ( 8299): #5      _InkResponseState.build.&lt;anonymous closure&gt; (package:flutter/src/material/ink_well.dart:549:30)
E/flutter ( 8299): #6      GestureRecognizer.invokeCallback (package:flutter/src/gestures/recognizer.dart:102:24)
E/flutter ( 8299): #7      TapGestureRecognizer._checkUp (package:flutter/src/gestures/tap.dart:161:9)
E/flutter ( 8299): #8      TapGestureRecognizer.handlePrimaryPointer (package:flutter/src/gestures/tap.dart:94:7)
E/flutter ( 8299): #9      PrimaryPointerGestureRecognizer.handleEvent (package:flutter/src/gestures/recognizer.dart:315:9)
E/flutter ( 8299): #10     PointerRouter._dispatch (package:flutter/src/gestures/pointer_router.dart:73:12)
E/flutter ( 8299): #11     PointerRouter.route (package:flutter/src/gestures/pointer_router.dart:101:11)
E/flutter ( 8299): #12     _WidgetsFlutterBinding&amp;BindingBase&amp;GestureBinding.handleEvent (package:flutter/src/gestures/binding.dart:143:19)
E/flutter ( 8299): #13     _WidgetsFlutterBinding&amp;BindingBase&amp;GestureBinding.dispatchEvent (package:flutter/src/gestures/binding.dart:121:22)
E/flutter ( 8299): #14     _WidgetsFlutterBinding&amp;BindingBase&amp;GestureBinding._handlePointerEvent (package:flutter/src/gestures/binding.dart:101:7)
E/flutter ( 8299): #15     _WidgetsFlutterBinding&amp;BindingBase&amp;GestureBinding._flushPointerEventQueue (package:flutter/src/gestures/binding.dart:64:7)
E/flutter ( 8299): #16     _WidgetsFlutterBinding&amp;BindingBase&amp;GestureBinding._handlePointerDataPacket (package:flutter/src/gestures/binding.dart:48:7)
E/flutter ( 8299): #17     _invoke1 (dart:ui/hooks.dart:134:13)
E/flutter ( 8299): #18     _dispatchPointerDataPacket (dart:ui/hooks.dart:91:5)
</code></pre>

<p>restarting the app from ide doesn't work.</p>
