I got above error when try to deploy app in non-development site collection. so i created a development site collections in o365 admin center. Finally I could deploy the solution.
OR We can make below configuration to deploy the app solutions.
So that’s a no-go, because “sideloading of apps is not enabled on this site“. After some research on the MSDN forums, I found a PowerShell script allowing you to enable Sideloading. Because it’s not available in the interface, the only option you have is to run the PowerShell script to enable this feature. (There is not quite much information about this Sideloading thing yet though).
The first thing you have to do is download the SharePoint Online management Shell (link). The PowerShell script you can use is:
MORE INFO : http://www.alexandervanwynsberghe.be/debugging-apps-for-sharepoint-online/
MORE INFO : http://www.alexandervanwynsberghe.be/debugging-apps-for-sharepoint-online/
