Ads Causing Unity to Crash on Startup of Program

This is my first time attempting to implement ads. I have everything I need installed and followed all of the steps. I even resorted to copy/paste the code off the unity guide page.

My first thought is maybe the fact I have my program set into portrait mode only and additionally I don't have my Game view set to any custom size MIGHT have something to do with this. You'll see I'm Free Aspect


I also made sure the ads and test modes were enabled to conduct the test


Here is the code I'm using

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4. using UnityEngine.Monetization;
5.  
6. public class VideoAds : MonoBehaviour
7. {
8.     private string store_id = "111111"; // I edited random numbers here but mine is the correct in my code
9.     private string vidAd = "video";
10.     private bool testMode = true; // This needs to be FALSE before publishing
11.  
12.     private void Start()
13.     {
14.         Monetization.Initialize(store_id, testMode); // Change testMode to FALSE before publishing
15.         ShowAd();
16.         //StartCoroutine(ShowAd());
17.     }
18.     public void ShowAd()
19.     {
20.         StartCoroutine(ShowAdWhenReady());
21.     }
22.  
23.     private IEnumerator ShowAdWhenReady()
24.     {
25.         while (!Monetization.IsReady(vidAd))
26.         {
27.             yield return new WaitForSeconds(0.25f);
28.         }
29.  
30.         ShowAdPlacementContent ad = null;
31.         ad = Monetization.GetPlacementContent(vidAd) as ShowAdPlacementContent;
32.  
33.         if (ad != null)
34.         {
35.             ad.Show();
36.         }
37.     }

I got this code from the unity website. However, Unity crashes upon play.
https://unityads.unity3d.com/help/unity/integration-guide-unity

I'm using Unity 2019.1.0a10

 

Go to services > Ads > Turn off built in ads

Remove
-Plugin/Android
-Plugin/iOS

Re-Import Unity ADS from asset store

( Do not check build-in ads extension )

 

Ok, I unchecked built in ads and that did work!

However, I believe the true cause of my crash/error was a much different issue. I discovered Scripting Runtime Version under Edit>Project Settings>Player. I was using ,NET 3.5(Depreciated) and I changed it to .NET 4.x Equivalent. This made my program stop crashing on run time. Your advice to uncheck actually made the test video appear.

Thank you!