WebGL doesn't work when using UnityEngine.Advertisements

Whenever I try to build to WebGL, I receive the following error:

Assets/Scripts/SettingsButtons.cs(98,17): error CS0246: The type or namespace name `ShowOptions' could not be found. Are you missing a using directive or an assembly reference?

Does this mean that it won’t work because of the advertisements? If so, how can I have them automatically be disabled when I build to WebGL?

Here’s the full script for context (It’s a kind of swiss-army knife script so there’s a bunch of useless stuff in there. I’ll remove what I can)

using UnityEngine;
using UnityEngine.UI;
using UnityEngine.Analytics;
using UnityEngine.Advertisements;
using System;
using System.Collections;
using System.Collections.Generic;

public class SettingsButtons : MonoBehaviour {

	public bool Value;
	public Image Img;
	public Sprite EnabledSprite;
	public Sprite DisabledSprite;

	//Ads Stuff 

	public string zoneId;

	// Use this for initialization
	void Start () {

		GameObject.Find("MainMenu").GetComponent<Animator>().SetBool("Visible", true);
		GameObject.Find("ExtraMenu").GetComponent<Animator>().SetBool("Visible", false);


	}
	
	// Update is called once per frame
	void Update () {


	
	}

	public void ShowAd () {
		
		if (string.IsNullOrEmpty (zoneId)) zoneId = null;

		ShowOptions options = new ShowOptions();
		options.resultCallback = HandleShowResult;

		Advertisement.Show (zoneId, options);

	}

	public void ExpressAppreciation () {
		GameObject.Find("Thanks").GetComponent<Animator>().SetTrigger("Show");
	}
	public void ExpressRegret () {
		GameObject.Find("YouSuck").GetComponent<Animator>().SetTrigger("Show");
	}
	public void ExpressERROR () {
		GameObject.Find("Error").GetComponent<Animator>().SetTrigger("Show");
	}

	private void HandleShowResult (ShowResult result)
	{
		switch (result)
		{
		case ShowResult.Finished:
			ExpressAppreciation();
			break;
		case ShowResult.Skipped:
			ExpressRegret();
			break;
		case ShowResult.Failed:
			ExpressERROR();
			break;
		}
	}

}

Thanks in advance if someone can help.

Wrap your advertise code with preprocessor directives for WebGL. This will keep the code from being compiled for that platform, rather than having to manually remove it yourself.