总结：SharePoint 2010 -- Error and Solution（2）-- FileNotFoundException was caught

Description

The Web application at http://localhost 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.

Reason

Maybe it configures not correct for the Target Framework or the Platform Target in the project Property.

Solution

Target Framework: make sure to select correct framework.

Platform Target: it is better to select “Any CPU”.