Microsoft.SharePoint.Administration.SPDuplicateObjectException
This (Microsoft.SharePoint.Administration.SPDuplicateObjectException) error sometimes occurs when deploying a Web Part to your ShrarePoint 2007 environment. To solve this error:
- Close your solution
- Browse to the YourWebPart/bin/Debug/ directory
- Run the setup.bat /uninstall /url:http://yourhost
You can then choose to deploy your Web Part using the setup.bat with the /install switch or by opening Visual Studio.NET and right click on your solution and hit deploy.