The Web application at URL could not be found. Verify that you have typed the URL correctly. If the URL should be serving existing content, the system administrator may need to add a new request URL mapping to the intended application.

This is a common error we are came across most of the time.

When you are running inside the SharePoint common resolutions are

Running the web application in 64-bit mode.
Changing to target framework to 3.0 instead of 4.0
Adding app pool identity user to WSS_ADMIN_WPG
Adding app pool identity user to Administrator group

Ref : http://spnovice.blogspot.com/2012/11/the-web-application-at-url-could-not-be.html

But when you are creating a Web Service (WCF) or a Other Web Project which is ruining inside the SharePoint server but not inside the SharePoint You need to Change the AppPool Account to; which SharePoint is running.

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