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``` Why am I receiving the error "Ad response does not contain a valid ad type"? : This error generally appears because no ads have been targeted to the specific `publisherId` (for the given time period). This condition may vary throughout the day, or over several days as campaigns begin and end. You should check that the ad you wish to target has not expired and that the ad targeting criteria are correct. As long as ads are properly requested, received, and rendered using the test `publisherId`, you can be sure that these ads are properly handled using your live `publisherId` when the ads are available. Do you have an Ad Manager video ad tag that I can use for testing? : Sample tags are available on the [sample tags](https://developers.google.com/interactive-media-ads/docs/sdks/android/client-side/tags.md.txt) page. Should I set the `adSlotWidth` and `adSlotHeight` to the same values as the `sz` in my Ad Manager ad tag? : Not necessarily. The `adSlotWidth` and `adSlotHeight` must be set to the width/height of the player or area you want your ads to fill. They are used by AdSense to determine which ads are available to fit into that space. The `sz` key/value pair in your Ad Manager ad tag is a targeting parameter and does not necessarily affect the creative served (more information below). The demo ad tag looks great, but when I switch it with my ad tag, no ad appears. : Check to ensure that something is trafficked to the ad tag you are requesting. The easiest way to find out is to watch the HTTP traffic. If a **1x1 pixel grey.gif** image is returned within an HTML anchor block, then you need to check your targeting in Ad Manager. I want to request ads using the same tag more than once, but I only get ads for my first request. How do I fix this? : When you request ads more than once, you need to let the ad server know that these are legitimate requests, and not accidental duplicates. The SDK does this for you with two quick API calls: 1. Call `destroy()` on your `AdsManager` instance. This prevents any post-rolls from playing when you make the below call to `contentComplete()`. You get a new `AdsManager` when you make your next request. 2. Call `contentComplete()` on your `AdsLoader` instance. This resets the SDK so the new ad request doesn't look like a duplicate of the previous one. After making the two calls above, you can call `requestAds()` on your `AdsLoader` instance to get another set of ads to play for your new video. How do I request overlay and full slot AdSense ads using the IMA SDK? : To request AdSense ads using the SDK, you need to first obtain an AdSense ad tag. You can learn more about that on the [AdSense for Video page](https://support.google.com/adsense/answer/1705822). Once you have your tag, you need to take the following steps to make either an overlay or a full slot ad request: **Overlay ads** 1. In your `AdsRequest`, set your ViewModes to `NORMAL`. 2. In your ad tag, add the parameter `overlay=1`. **Full slot ads** 1. In your `AdsRequest`, set your ViewModes to `FULLSCREEN`. 2. In your ad tag, add the parameter `overlay=0`. I'm getting an "Invalid clickthrough URL" error when I click on my ad. What could be the cause? : The most common cause for this error is an improperly escaped clickthrough URL. If you're seeing this error, check to make sure that your clickthrough URL is properly escaped in your VAST response. In the Android and iOS SDKs, is there a way to make the entire video ad clickable? : As far as whole-video click tracking goes, the standard viewer experience for mobile video that has emerged is that tapping on a video either pauses it or brings up the player controls. To avoid users unintentionally clicking on ads when they really just want access to the player controls IMA uses the **Learn more** button to let users click on an ad and learn more about the product being advertised. Why do I see a "VAST Document Empty" error? : This error occurs when the ad tag returns an empty VAST document, indicating that the ad was not served properly. Talk to your account manager or ad server representative to see why your ad tag is not working. Can I change the size/text of the **Skip Ad** box or other UI elements? : The IMA SDKs do not support changing the layout, size, or content of UI elements. For more details on UI elements, see `AdsManager.uiElements`. Why am I getting "No virtual method" errors at runtime? : Error messages similar to the following are caused by using an older version of Google Play services that does not include the advertising ID. ``` No virtual method getInfo()Lcom/google/android/gms/ads/identifier/AdvertisingIdClient$Info; in class Lcom/google/android/gms/ads/identifier/AdvertisingIdClient; or its super classes (declaration of 'com.google.android.gms.ads.identifier.AdvertisingIdClient' ``` Upgrading to version 4.0 or later (but preferably the latest) solves this problem. Can I use multiple threads to initialize and manipulate the UI? : No, all initialization and manipulation of the UI must be done on the main thread. In Android, UI objects are not thread-safe. See [Threads](https://developer.android.com/guide/components/processes-and-threads.html#Threads) for more information.