I just create a VM to be my development environment, with a WS2008 R2 with latest service pack, has VS2013 also has a SharePoint farm. All working well.
I'm trying to create a simple app and launching it into a Development Site in this SharePoint 2013 instance. But I'm getting unexpected error after click in "trust in this app". (sometimes this trust message is even not been shown).
Full Error
An unexpected error has occurred.
Please try again by launching the app installed on your site.