"An unexpected error has occurred."
Steps To Reproduce:
- Browse to a SharePoint site
- From the Site Settings menu click on "Edit In SharePoint Designer"
- Within SharePoint Designer, choose left menu "Lists and Items"
- From the Ribbon menu click "List from Spreadsheet"
- SharePoint Designer will launch the SharePoint site within a browser
- Add a title on the list and choose File then click Import
- You will get error message "An unexpected error has occurred"
Append to the URL on the page that is being called from Sharepoint Designer with the following and reload the page.