How to resolve "Unhandled Exception: type 'List<dynamic>' is not a subtype of type 'PlaceDetails' "? - flutter

Question

I want to draw Polyline from my current location to another dynamic location. But
sometimes it's being draw but sometimes throwing exception when I search places with flutter_google_places plugin.
Unhandled Exception: type 'List<dynamic>' is not a subtype of type 'PlaceDetails'
here Some piece of my code:
Api:
const kGoogleApiKey = "AIz#######_###############";
GoogleMapsPlaces _places = GoogleMapsPlaces(apiKey: kGoogleApiKey);
Here I Declared a list type variable with LatLng type:
List<LatLng> latlng = [];
current Location:
// I called this method from initState() method
void getCurrentLocation()async{
Position pos= await Geolocator().getCurrentPosition();
setState(() {
position = pos;
print("CurrentLatLng__= ${position.latitude + position.longitude }");
latlng.add(LatLng(position.latitude,position.longitude)); // Adding current location to the list
});
}
Google Map:
body: GoogleMap(
initialCameraPosition: CameraPosition(
target: LatLng(position.latitude,position.longitude),
zoom: 14.4746,
),
compassEnabled: true,
myLocationEnabled: true,
// myLocationButtonEnabled: true,
mapType: MapType.normal,
onMapCreated: (GoogleMapController controller){
_controller.complete(controller);
},
markers: isSelectedDropff
?{ Marker(
markerId: MarkerId(globalPlaceIdDropOff),
infoWindow: InfoWindow(
title: placeNameDropOff,
// snippet: "${responseResult.types?.first}"
),
icon: BitmapDescriptor.defaultMarker,
position: LatLng(dropOffLat , dropOffLng ),
),
}:
{
Marker(
markerId: MarkerId("current loc"),
infoWindow: InfoWindow(
title: "Current",
// snippet: "${responseResult.types?.first}"
),
icon: BitmapDescriptor.defaultMarkerWithHue(BitmapDescriptor.hueGreen),
position: LatLng(position.latitude, position.longitude),
),
},
polylines: isSelectedDropOff ?{
Polyline(
polylineId: PolylineId("One") ,
points:latlng,
color: Colors.red,
visible: true
)
}
:null,
),
Autocompleter:
onTap: ()async{
// show input autocomplete with selected mode
// then get the Prediction selected
Prediction p =await PlacesAutocomplete.show(
context: context,
apiKey: kGoogleApiKey,
mode: Mode.overlay, // Mode.fullscreen
language: "fr",
components: [new Component(Component.country, "fr")]
);
displayPredictionDropOff(p);
},
// called it from TextField widget with it's constructor onTap:
Future<Null> displayPredictionDropOff(Prediction p) async {
if (p != null) {
PlacesDetailsResponse detail =
await _places.getDetailsByPlaceId(p.placeId); //Note: exception occurring at this line
var placeId = p.placeId;
double lat = detail.result.geometry.location.lat;
double lng = detail.result.geometry.location.lng;
var address = await Geocoder.local.findAddressesFromQuery(p.description);
setState(() {
placeNameDropOff = detail.result.name;
dropOffLat = lat;
dropOffLng = lng;
globalPlaceIdDropOff = placeId;
isSelectedDropOff = true;
latlng.add(LatLng(lat,lng)); // add second location to the list
});
print("lat------$lat");
print("lng--------$lng");
print("description-----${p.description}");
print("name------${detail.result.name}");
print("address----------$address");
final GoogleMapController controller = await _controller.future;
controller.animateCamera(CameraUpdate.newCameraPosition(
CameraPosition(
target: LatLng(lat, lng),
zoom: 19.151926040649414
),
));
}
}
Note: exception (Unhandled Exception: type 'List' is not a subtype of type 'PlaceDetails') occurring at below line
PlacesDetailsResponse detail =
await _places.getDetailsByPlaceId(p.placeId);