If you are getting the below error while adding an SharePoint App you probably hit a bug in Office 365 developer site.
Error - "Error occurred in deployment step 'Uninstall App for SharePoint': Value cannot be null. Parameter name: value"
I got this error thrice at different times and in different Apps... Microsoft says its a bug as per the Discussion Here but I am still looking for a good explanation.
Yes, it is a bug. But we can fix it manually by following steps here:
ReplyDeletehttp://praveenbattula.blogspot.in/2012/07/uninstall-app-for-sharepoint-value.html