Server Application Unavailable (The web application you are attempting to access on this web server is currently unavailable.)

You deployed your project to IIS and got this error.

Server Application Unavailable
The web application you are attempting to access on this web server is currently unavailable. Please hit the "Refresh" button in your web browser to retry your request.
Administrator Note: An error message detailing the cause of this specific request failure can be found in the application event log of the web server. Please review this log entry to discover what caused this error to occur.

There are several reasons for this this error.

Follow and try this steps:

1. Check application on IIS and create if not created.

2. Give asp.net user access to the web application folder. Probably it will work.

If still not work; edit web.config;

customerrors mode="Off"

and check Event Log for error messages.

Hope it works.