Hello "Gayle Myers",

 I also see this same error: "This application is currently offline. To enable the application, remove the app_offline.htm file from the application root directory.", without any reason, I mean, there is no "app_offline" page is there with this website.

In my case, it comes on my development machine, sometimes, may be 2 to 3 times every 50 times run. Then, I immediately refresh the website using the browser's "F5" key and in almost all times, it goes, but few times, it does not, then I have to refresh the page for several times by the same means and if then also it does not go, then I close the browser and run the website again from the Visual Studio and it goes.

But what I can guess, it is may be generating due to overload of the website Or may some ghost reason :)

Thanks.