Unity build issue - GooglePlayGamesManifest and GameServicesManifest

I have added leaderboard to my unity game for which I have used the google play services plugin. But when I try to build, this is the error I get:

 Execution failed for task 'processReleaseManifest'.
> Manifest merger failed : Attribute meta-data#com.google.android.gms.games.APP_ID@value value= 
(\728999946156) from [:unityLibrary:GameServicesManifest.plugin] AndroidManifest.xml:10:13-42 
is also present at [:unityLibrary:GooglePlayGamesManifest.plugin] AndroidManifest.xml:20:13-46 value= 
(\u003728999946156).
Suggestion: add 'tools:replace="android:value"' to <meta-data> element at AndroidManifest.xml:8:9- 
10:45 to override.

Here's what's in the first manifest file:

<?xml version="1.0" encoding="utf-8"?>
<!-- This file was automatically generated by the Google Play Games plugin for Unity
 Do not edit. -->
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.google.example.games.mainlibproj"    
android:versionCode="1"
android:versionName="1.0" >

<uses-sdk android:minSdkVersion="14" />
<application>
    <!-- The space in these forces it to be interpreted as a string vs. int -->
    <meta-data android:name="com.google.android.gms.games.APP_ID"
        android:value="\u003728999946156" />        
    <!-- Keep track of which plugin is being used -->
    <meta-data android:name="com.google.android.gms.games.unityVersion"
        android:value="\u0020.20.20" />
    <activity android:name="com.google.games.bridge.NativeBridgeActivity"
        android:theme="@android:style/Theme.Translucent.NoTitleBar.Fullscreen" />
</application>

and the second file:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android = "http://schemas.android.com/apk/res/android"
package="com.google.example.games.mainlibproj">
<application>
<meta-data android:name="com.google.android.gms.games.APP_ID" android:value = "\728999946156" />
<activity android:name="com.google.games.bridge.NativeBridgeActivity" android:theme = 
"@android:style/Theme.Translucent.NoTitleBar.Fullscreen" />
</application>
</manifest>