Revmob ads not showing

Question

I have problem on Revmob. I want to add revmob banner ads on my project but it doesn't show anything. Please help me to find-out my mistake.

My MainActivity.java

  package com.test.project;

import android.util.Log;
import rm.com.android.sdk.Rm;
import rm.com.android.sdk.RmListener;
import rm.com.android.sdk.ads.banner.RMBannerView;

public class MainActivity extends BaseActivity {

    String YOUR_REVMOB_APP_ID = "59d8ea0d23a7ae2ea50a0688";
    String YOUR_REVMOB_PLACEMENT_ID = "59d8ea0d23a7ae2ea50a0688";
    RMBannerView banner;

@Override
   protected void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.your_layout);

      Rm.init(this, YOUR_REVMOB_APP_ID);

/** Cache Banner **/
       Rm.cacheBanner(YOUR_REVMOB_PLACEMENT_ID, new RmListener.Cache() {

           @Override
           public void onRmAdReceived() {
               Log.i("RevMob","Banner Ready to be Displayed");
               //At this point, the banner is ready to be displayed.
               showBanner();
           }

           @Override
           public void onRmAdNotReceived(String message) {
               Log.i("RevMob","Banner Not Failed to Load");
           }
       });
   }

   public void showBanner() {

       if (Rm.isBannerLoaded(YOUR_REVMOB_PLACEMENT_ID)) {
           banner = Rm.getBanner(this, YOUR_REVMOB_PLACEMENT_ID, new RmListener.Get() {

               @Override
               public void onRmAdDisplayed() {
                   Log.i("RevMob","Banner Displayed");
               }

               @Override
               public void onRmAdFailed(String message) {
                   Log.i("RevMob","Banner Not Failed to Load");
               }

               @Override
               public void onRmAdDismissed() {
                   Log.i("RevMob","Banner Dismissed");
               }

               @Override
               public void onRmAdClicked() {
                   Log.i("RevMob","Banner Clicked");
               }
           });

           /** Show Banner **/
           ViewGroup view = (ViewGroup) findViewById(R.id.layout_banner);
           view.removeAllViews();
           view.addView(banner);
       }
   }
}

My activitymain.xml

<linearlayout android:id="@+id/layout_banner" android:layout_width="wrap_content" android:layout_height="wrap_content" android:gravity="center_horizontal">
</linearlayout>

My AndroidManifest.xml

    <?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    package="com.test.project">


    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
    <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" />

    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />

    <application
        tools:replace="android:icon"
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">

        <activity
            android:name=".MainActivity"
            android:configChanges="keyboardHidden|orientation"
            android:label="@string/app_name"
            android:theme="@style/AppLTheme"
            android:screenOrientation="portrait" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

           <activity android:name="rm.com.android.sdk.RmInterstitial"
            android:configChanges="keyboardHidden|orientation|screenSize">
        </activity>

 </application>
</manifest>

My gradle

dependencies { compile fileTree(include: ['*.jar'], dir: 'libs') androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', { exclude group: 'com.android.support', module: 'support-annotations' }) compile 'com.android.support:appcompat-v7:25.2.0' testCompile 'junit:junit:4.12' compile files('libs/rm.jar') }

Help me to resolves this problem!