The extension context does not have a method with the name init. about aneadmob HOT 8 CLOSED

import flash.display.MovieClip;

import com.pozirk.ads.admob.AdMob;
import com.pozirk.ads.admob.AdParams;
import com.pozirk.ads.admob.AdEvent;
import flash.events.MouseEvent;

public class Main extends MovieClip {
	
	private var _bannerAdUID:String = "ca-app-pub-6896619151286612/6300978111";
	private var _intersAdUID:String = "ca-app-pub-3940256099942544/1033173712";
	protected var _banner:AdMob = new AdMob();
	protected var _inters:AdMob = new AdMob();
	private var _initOK:Boolean = false;
	private var _isShow:Boolean = false;
	private var _cacheOK:Boolean = false;
	public function Main() {
		// constructor code
		btBanner.addEventListener(MouseEvent.CLICK, showBanner);
		btInters.addEventListener(MouseEvent.CLICK, showInterstitial);
		_banner.init();
		_banner.addEventListener(AdEvent.INIT_OK, onInitEvent);
		_banner.addEventListener(AdEvent.INIT_FAIL, onEvent);
		_banner.addEventListener(AdEvent.BANNER_SHOW_OK, onEvent);
        _banner.addEventListener(AdEvent.BANNER_SHOW_FAIL, onEvent);
		_banner.addEventListener(AdEvent.BANNER_LEFT_APP, onEvent);
		_banner.addEventListener(AdEvent.BANNER_OPENED, onEvent);
		_banner.addEventListener(AdEvent.BANNER_CLOSED, onEvent);
		
		_inters.init();
		_inters.addEventListener(AdEvent.INIT_OK, onInitEvent);
		_inters.addEventListener(AdEvent.INIT_FAIL, onEvent);
		_inters.addEventListener(AdEvent.INTERSTITIAL_SHOW_OK, onEvent);
		_inters.addEventListener(AdEvent.INTERSTITIAL_SHOW_FAIL, onEvent);
		_inters.addEventListener(AdEvent.INTERSTITIAL_CACHE_OK, onCacheEvent); 
		_inters.addEventListener(AdEvent.INTERSTITIAL_CACHE_FAIL, onEvent); 
		_inters.addEventListener(AdEvent.INTERSTITIAL_LEFT_APP,onEvent);
		_inters.addEventListener(AdEvent.INTERSTITIAL_OPENED, onEvent);
		_inters.addEventListener(AdEvent.INTERSTITIAL_CLOSED, onCloseIntersEvent);
		
		_inters.cacheInterstitial(_intersAdUID);
		
		}
		
		protected function onEvent(event:AdEvent):void{}
		protected function onInitEvent(event:AdEvent):void{
               _initOK = true;				
			}
		protected function onCacheEvent(event:AdEvent):void{
			    _cacheOK = true;
			}
		protected function onCloseIntersEvent(event:AdEvent):void{
			    _inters.cacheInterstitial(_intersAdUID);
			}
			
		private function showBanner(event:MouseEvent):void{
			if(_initOK){
				
				if(!_isShow)
				{
					_banner.show(_bannerAdUID, AdParams.SIZE_SMART_BANNER, AdParams.HALIGN_CENTER, AdParams.VALIGN_BOTTOM)
					_isShow = true;
					
					
					}
				else
				{
					_banner.hide();
					_isShow = false;
					}
				
				}
				else
				{
					trace("banner not ready");
					}
			
			}
			
			private function showInterstitial(event:MouseEvent):void
			{
				if(_initOK && _cacheOK)
				{
                     			_inters.showInterstitial();			
					}
					else
					{
						trace("inters not ready");
						}
				
				}
}