I have a provider hosted app with
AppUpgraded event receivers. Remote web for this app is hosted on Azure VM. App is available to all site collection through App Catalog site. I installed this app on one of my site collection. While testing the app upgrade feature, I encountered following error:
The content database on the server is temporarily unavailable. Details: 0x80070002 There is no Web named "/_Copy.
I retried multiple times but no luck. I also tried on different site collections but I get the same error.
Furthermore, I observed that it is happening only with 'AppUpgraded' event receiver added. Upgrade works when I remove this event receiver.