Webpart error

I was getting this error when I try to add webpart which was successfully deployed.

A Web Part or Web Form Control on this Page cannot be displayed or imported. The type could not be found or it is not registered as safe.

Did some R&D nothing worked out later got to know that my class name was wrong in Testwebpart.webpart file.  This is because I have renamed the project after creating it.

xml version="1.0" encoding="utf-8"?>

xmlns="http://schemas.microsoft.com/WebPart/v3">

name="Namespace.Class1, $SharePoint.Project.AssemblyFullName$" />