Unity Android Flurry error

 using UnityEngine;
 using System;
 using System.Collections;
 using System.IO;
 using System.Collections.Generic;
 using System.Linq;
 
 
 public class FlurryManager : MonoBehaviour {
 
 
 
     public FlurryAgent _flurry;
 
     void Start () {
          _flurry = new FlurryAgent();
         _flurry.onStartSession ("VRBZ2Y3B7235HQ7WQC9Y");
         _flurry.logEvent("something");
         _flurry.onPageView();
     }
     public void OnApplicationQuit(){
         _flurry.onEndSession();    
         }
     // Update is called once per frame
     void Update () {
         _flurry.logEvent("somethinggg");
         _flurry.onPageView();
     }
     void OnGUI(){
     }
 }

Manifest:

 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.Grupa2.RocketThruster" android:theme="@android:style/Theme.NoTitleBar" android:versionName="1.0" android:versionCode="1" android:installLocation="auto">
   <supports-screens android:smallScreens="true" android:normalScreens="true" android:largeScreens="true" android:xlargeScreens="true" android:anyDensity="true" />
   <application android:icon="@drawable/app_icon" android:label="@string/app_name" android:debuggable="false">
     <activity android:name="com.flurry.android.FlurryAgent" android:configChanges="keyboardHidden|orientation" />
     <activity android:name="com.unity3d.player.UnityPlayerNativeActivity" android:launchMode="singleTask" android:label="@string/app_name" android:configChanges="fontScale|keyboard|keyboardHidden|locale|mnc|mcc|navigation|orientation|screenLayout|screenSize|smallestScreenSize|uiMode|touchscreen" android:screenOrientation="landscape">
       <activity android:name="com.flurry.android.FlurryAgent" android:configChanges="keyboardHidden|orientation" />
       <intent-filter>
         <action android:name="android.intent.action.MAIN" />
         <category android:name="android.intent.category.LAUNCHER" />
       </intent-filter>
       <meta-data android:name="unityplayer.ForwardNativeEventsToDalvik" android:value="false" />
     </activity>
   </application>
   <uses-sdk android:minSdkVersion="9" android:targetSdkVersion="19" />
   <uses-feature android:glEsVersion="0x00020000" />
   <uses-feature android:name="android.hardware.touchscreen" />
   <uses-feature android:name="android.hardware.touchscreen.multitouch" android:required="false" />
   <uses-feature android:name="android.hardware.touchscreen.multitouch.distinct" android:required="false" />
   <uses-permission android:name="android.permission.WAKE_LOCK" />
   <uses-permission android:name="android.permission.INTERNET" />
   <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
   <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
 </manifest>

I only recieve information that the session occured but there are no events displayed. I have FlurryAgent.cs FlurryAgent.jar and manifest in Plugins/Android. I got an error "NullReferenceException: Object reference not set to an instance of an object" referencing to lines in onApplicationQuit and Update functions.