Error when building with Phonegap Build

[Craig-Fisk]

Hey guys i'm getting the following build error when trying to use your plugin with Phonegap Build service:

Error - A plugin you are using requires a preference: ANDROID_PLAY_SERVICES_GAMES_VERSION

I've tried to add this preference to my config.xml, below is my example config.xml:

<?xml version="1.0" encoding="UTF-8" ?>
<widget xmlns   = "http://www.w3.org/ns/widgets"
    xmlns:gap   = "http://phonegap.com/ns/1.0"
    xmlns:android   = "http://schemas.android.com/apk/res/android"
    id          = "APPID"
    versionCode = "42"
    version     = "1.6.2" >

<!-- versionCode is optional and Android only -->

  <name>My App Name</name>

  <description>
      My Description
  </description>

  <author href="http://www.craigfisk.co.uk" email="[email protected]">
      Craig Fisk
  </author>

  <platform name="android" />
  <preference name="android-targetSdkVersion" value="28" />

  <preference name="" value="" />
  <preference name="DefaultVolumeStream" value="media" />

  <preference name="DisallowOverscroll" value="true" />
  <preference name="EnableWebGL" value="true" />
  <preference name="StatusBarOverlaysWebView" value="false" />
  <preference name="FullScreen" value="true" />
  <preference name="KeepRunning" value="false" />
  <preference name="Orientation" value="portrait" />
  <preference name="Suppresses3DTouchGesture" value="true" />
  <preference name="SuppressesLongPressGesture" value="true" />
  <preference name="WindowSize" value="fullscreen" />
  <preference name="EnableViewportScale" value="true" />

  <plugin name="cordova-plugin-statusbar" />

  <plugin name="cocoon-plugin-ads-android-admob" />

  <gap:plugin name="cordova-plugin-play-games-services" source="npm">
    <param name="APP_ID" value="MYAPPID" />
    <param name="ANDROID_PLAY_SERVICES_GAMES_VERSION" value="+" />
    <param name="ANDROID_PLAY_SERVICES_PLUS_VERSION" value="+" />
  </gap:plugin>

  <config-file platform="android" parent="/manifest/application" mode="merge">
    <meta-data android:name="com.google.android.gms.ads.APPLICATION_ID" android:value="MYAPPID" />
  </config-file>

  <platform name="android">
    <icon src="res/android/ldpi.png" density="ldpi" />
    <icon src="res/android/mdpi.png" density="mdpi" />
    <icon src="res/android/hdpi.png" density="hdpi" />
    <icon src="res/android/xhdpi.png" density="xhdpi" />
    <icon src="res/android/xxhdpi.png" density="xxhdpi" />
    <icon src="res/android/xxxhdpi.png" density="xxxhdpi" />
  </platform>

</widget>

[fax1ty]

@artberri Please add package.json to the root of the project where the current location will be specified. Without it, the plugin cannot be installed on new versions of Cordova