Enable-SPFeature : A list, survey, discussion board, or document library with the specified title already exists in this Web site.
SharePoint 2010: Today to update a list definition, I manually deleted a list, then disable and then enable the feature trying to recreate the list, but I got weird error: "Field name already exists. The name used for this field is already used by another field in the list. Select another name and try again." Investigation showed this error info did not make sense. Suddenly the error info changed to: "Enable-SPFeature : A list, survey, discussion board, or document library with the specified title already exists in this Web site...." In one word, I was no longer able to create the list using this feature. SharePoint Manager showed: the Alert list was really deleted but its ROOTFOLDER was still left there - weird! I deleted this folder, all errors are gone! Thanks to this link which enlightened me a bit: http://blog.repsaj.nl/index.php/2010/04/sp2010-error-activating-sharepoint-server-publishing-infrastructure/