What is the content of your message?
Message Content means that information contained within a Message or accompanying a Message.
How do you write a warning message?
Include: the reason for the warning and the potential problem, how someone should act, and what happens if they don't act. If you don't know the reason for a warning, don't make one up – just say that something's gone wrong and offer a solution for what they can do. Avoid repeating content from the title.