Why am I getting an error "Couldn't load messages" when embedding the Web Widget script to Google sites?

Question

I received the following error when trying to embed the Web Widget script on our Google site: Couldn't load messages. Why is it not working?

Answer

It's not possible to embed the Zendesk Web Widget on Google sites because it restricts the tags and set of JavaScript commands that can be used. Google sites do not give users access to the document head element of the webpage. The Web Widget only functions on sites where you have greater access to the HTML document and greater control over the code.

For more information, see this article: Installing Zopim for Google Sites.