One of the most common questions that crops up time and time again in the Google Sites help forums relates to Site disablements due to Terms of Service violations. There are two main reasons for a Google Site to show as disabled. a) The individual Site in question is deemed to be in breach of Google's Terms of Service or b) the account of one of the Site owners is deemd to be in breach of Google's Terms of Service. This article aims to help users understand which one applies in their case and what they can do about it.
Then, as the message suggests, one (or more) accounts that is an owner of the site has been disabled.