I am using google map on my flutter application:

FlexibleSpaceBar(
     background: GoogleMap(
     mapType: MapType.terrain,
     zoomGesturesEnabled: false,
     zoomControlsEnabled: false,
     initialCameraPosition: CameraPosition(
     target: LatLng(
            (widget.address.latitude).toDouble(),
             (widget.address.longitude).toDouble()),
              zoom: 14.4746,
             ),
      onMapCreated: (GoogleMapController controller) {
           mapController = controller;
      },

I added google_maps_flutter_web: ^0.5.4+2 in yml file for flutter web and also I added :

 <script type="text/javascript"
    src="https://maps.googleapis.com/maps/api/js?key=mykey&callback=Function.prototype"></script>

in index.html.

Now when I am trying to use map controller and update new location :

  mapController.animateCamera(
      CameraUpdate.newLatLngZoom(
          LatLng(
              new double,
              new double),
          14));

I am getting this error :

You have included the Google Maps JavaScript API multiple times on this page. This may cause unexpected errors.
Google Maps JavaScript API has been loaded directly without loading=async. This can result in suboptimal performance. For best-practice loading patterns please see https://goo.gle/js-api-loading
Caught error: InvalidValueError: not a LatLng or LatLngLiteral with finite coordinates: in property lat: not a number

and just zoom will set.