java.lang.NoSuchMethodError

Hi all, I'm really stuck on this one. I believe I am having a conflict of plugins, but I'd really like to use everything that I have, by simply resolving the conflict.

I am by no means a plugin guru, so hopefully someone can help me.

Currently I am updating my projects, I am using Prime31, Admob, Chartboost, as well as Unity Ads, and Google Game Play Services.

I can build everything to Android fine, but I am not able to see any banners or interstitals from Prime31's Admob, Chartboost, as well as the Unity Video Ads.

I notice when it comes time to display a banner for Admob in my game, I get this message in Terminal watching a logcat:

 AndroidJavaException: java.lang.NoSuchMethodError: no static method "Lcom/prime31/AdMobPlugin;.instance()Ljava/lang/Object;"
 I/Unity   (25865): java.lang.NoSuchMethodError: no static method "Lcom/prime31/AdMobPlugin;.instance()Ljava/lang/Object;"
 I/Unity   (25865):     at com.unity3d.player.UnityPlayer.nativeRender(Native Method)
 I/Unity   (25865):     at com.unity3d.player.UnityPlayer.a(Unknown Source)
 I/Unity   (25865):     at com.unity3d.player.UnityPlayer$b.run(Unknown Source)
 I/Unity   (25865):   at UnityEngine.AndroidJNISafe.CheckException () [0x00000] in <filename unknown>:0 
 I/Unity   (25865):   at UnityEngine.AndroidJNISafe.GetStaticMethodID (IntPtr clazz, System.String name, System.String sig) [0x00000] in <filename unknown>:0 
 I/Unity   (25865):   at UnityEngine._AndroidJNIHelper.GetMethodID (IntPtr jclass, System.String methodName, System.String signature, Boolean isStatic) [0x00000] in <filename unknown>:0 
 I/Unity   (25865):   at UnityEngine.AndroidJNIHelper.GetMethodID (IntPtr javaClass, System.String methodName, System.String signature, Boolean isStatic) [0x00000] in <filename unknown>:0 
 I/Unity   (25865):   at UnityEngine._AndroidJNIHelper.GetMethodID[AndroidJavaObje

Here is my Manifest, in my Android folder:

 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.unity3d.player" android:installLocation="preferExternal" android:versionCode="6" android:versionName="1.4.1">
   <supports-screens android:smallScreens="true" android:normalScreens="true" android:largeScreens="true" android:xlargeScreens="true" android:anyDensity="true" />
   <application android:theme="@android:style/Theme.NoTitleBar.Fullscreen" android:icon="@drawable/app_icon" android:label="@string/app_name" android:debuggable="true">
     <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>
       <meta-data android:name="unityplayer.UnityActivity" android:value="true" />
     </activity>
   </application>
 </manifest>

I am running Android SDK version 24, as well as Java version 1.8.

Any help would be greatly appreciated.