HomePage2.dart

Future<void> onJoin() async{
    setState(() {
      myController.text.isEmpty 
      ? _validateError = true
      : _validateError = false;
    });
    await _permissionHandler.requestPermissions([PermissionGroup.camera, PermissionGroup.microphone]);

    Navigator.push(context, 
    MaterialPageRoute(
      builder: (context)=> CallPage(channelName: myController.text),)
    );
  }