> ## Knowledge Base Index
> Fetch the complete knowledge base index at: https://help.aads.com/sitemap.xml
> Use this file to discover available pages before exploring further.
> Pure-Markdown content can be obtained by appending a '.md' suffix to the content URLs listed in the sitemap (without the trailing slash).

# Ad Unit Error: Invalid URL in Ad Unit HTML Code

The `src` attribute should contain a normalized URL. If the URL is not normalized, you will receive an error message.

You can verify if the URL is correct by copying and pasting it into your browser's address bar; a banner should be displayed. For example, if you copy this:

![](https://storage.crisp.chat/users/helpdesk/website/6a953c4814a02400/image_emy0h7.png)

And see a banner:

![](https://storage.crisp.chat/users/helpdesk/website/6a953c4814a02400/image_oy1eq7.png)

So, the URL in the `src` attribute is correct.

### Here are examples of invalid URLs:

![1](https://storage.crisp.chat/users/helpdesk/website/6a953c4814a02400/image_1q1xtm2.png)

![2](https://storage.crisp.chat/users/helpdesk/website/6a953c4814a02400/image_1285emk.png)

![3](https://storage.crisp.chat/users/helpdesk/website/6a953c4814a02400/image_53nde5.png)

![4](https://storage.crisp.chat/users/helpdesk/website/6a953c4814a02400/image_d66psx.png)

||| Important: Earnings at AADS are only generated after an ad unit has been successfully detected by our system.
If an ad unit is not found (for example, due to incorrect installation, caching, blockers, or loading issues), impressions cannot be counted and no revenue can be accrued for that period.
For this reason, we strongly recommend verifying that the ad unit is detected immediately after installation and after any website changes.

If you have any questions about our platform, feel free to [contact our support team](https://help.aads.com/). We’re here to help 24/7.