I've been deploying a SharePoint Add-In from Visual Studio 2015 to our O365 developer site.
For the past few days though, it has shown this deployment error:
"Skipping the uninstall step because the SharePoint Add-in is in an invalid state and cannot be uninstalled."
How can I remove it? Or why won't SharePoint remove it? How do I get this to allow deployment? What could I be doing that would be interfering with this deployment?