xamarin.forms - Mapfragement error in xamarin map -


i getting error:

severity code description project file line suppression state error cs1061 'mapfragment' not contain definition 'map' , no extension method 'map' accepting first argument of type 'mapfragment' found (are missing using directive or assembly reference?) mymap f:\applications\gpslocationmap\gpslocationmap\mymap\mainactivity.cs 59 active

public void initializemap(double latitude,double longitude)     {           latlng location = new latlng(latitude, longitude);  // setting latitude , longitude                                                             // getting mapfragment         mapfrag = (mapfragment)fragmentmanager.findfragmentbyid(resource.id.map);         // setting mapfragment googlemap variable         google = mapfrag.map;           if (google != null)         {             google.maptype = googlemap.maptypenormal;  // setting map type              // creating marker              markeroptions marker = new markeroptions()                 .setposition(new latlng(latitude, longitude))                 .settitle("android codec");             //positioning camera according marker             cameraposition.builder builder = cameraposition.invokebuilder();             builder.target(location);             builder.zoom(15);             builder.bearing(155);


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