Error building Player: CommandInvokationFailure: Failed to re-package resources.

I have an android library project with resources and imported the library project in the Unity project here

F:\Unity\demoproject\testing\Testing\Assets\Plugins\Android)

When I am trying to build my project in Unity then I am getting the following error :-

   ner.png
         Src: (xhdpi-v4) res\drawable-xhdpi\app_banner.png
       drawable\app_icon.png
         Src: () res\drawable\app_icon.png
       values\strings.xml
         Src: () res\values\strings.xml
       AndroidManifest.xml
         Src: () AndroidManifest.xml
     
     Resource Dirs:
       Type drawable
         drawable\app_banner.png
           Src: (xhdpi-v4) res\drawable-xhdpi\app_banner.png
         drawable\app_icon.png
           Src: () res\drawable\app_icon.png
       Type values
         values\strings.xml
           Src: () res\values\strings.xml
     Including resources from package: F:\AndroidStudio\AndroidStudioSDK\sdk\platforms\android-22\android.jar
     applyFileOverlay for drawable
     applyFileOverlay for layout
     applyFileOverlay for anim
     applyFileOverlay for animator
     applyFileOverlay for interpolator
     applyFileOverlay for transition
     applyFileOverlay for xml
     applyFileOverlay for raw
     applyFileOverlay for color
     applyFileOverlay for menu
     applyFileOverlay for mipmap
     Processing image: res\drawable-xhdpi\app_banner.png
     Processing image: res\drawable\app_icon.png
         (processed image res\drawable\app_icon.png: 94% size of source)
         (processed image res\drawable-xhdpi\app_banner.png: 93% size of source)
         (new resource id app_banner from xhdpi-v4\drawable\app_banner.png #generated)
         (new resource id app_icon from drawable\app_icon.png #generated)
     ]

Unity Structure

Manifest.xml

 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="com.example.testinglib"
     android:versionCode="1"
     android:versionName="1.0" >
 
     <uses-sdk
         android:minSdkVersion="8"
         android:targetSdkVersion="21" />
 
     <application
         android:allowBackup="true"
         android:icon="@drawable/ic_launcher"
         android:label="@string/app_name"
         android:theme="@style/AppTheme" >
 
          <activity android:name="com.unity3d.player.UnityPlayerActivity"
                   android:label="@string/app_name">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
                 <category android:name="android.intent.category.LAUNCHER" />
             </intent-filter>
         </activity>
 
              <activity
             android:name=".MainActivity"
             android:label="@string/app_name" >
         </activity>
     </application>
 
 </manifest>

Script File

 using UnityEngine; 
 using System.Collections; 
  
 public class Freeb : MonoBehaviour { 
  
     // Use this for initialization 
     void Start () { 
  
     } 
  
     public void OnGUI(){ 
  
         if (GUI.Button (new Rect (50, 50, 100, 100), "Open")) {
             //AndroidJavaClass unity = new AndroidJavaClass ("com.unity3d.player.UnityPlayer"); 
  
             AndroidJavaClass unity = new AndroidJavaClass ("com.unity3d.player.UnityPlayer");
             AndroidJavaObject currentActivity = unity.GetStatic<AndroidJavaObject> ("currentActivity");
             currentActivity.Call ("createMethod", currentActivity);
         } 
  
     } 
  
  
 }