Sharepoint can't remove / uninstall app

Trying to deploy apps.
my app failed to install, going to the fly out, details, install error is "the remote hosting service is not configured. Details: unable to obtain master key"
deploying using visual studio 2012
there is no option in the fly out for deleting the app.
tried to remove app with powershell, using cmd Uninstall-SPAppInstance –Identity $appInstance -Confirm:$false -ErrorAction SilentlyContinue -ErrorVariable err;
this didn't work, and upon running now gives error msg 'another job exists for this app instance. Please retry after that job is done'
Have tried the work around (which isn't a fix at all) of changing productID# in the appmanifest. This works to get me moving forward, but still need a solution how to delete the previous app that didn't install correctly.
anyone have ideas? Thanks

hi,
i have found no other way then delete the entry in the content-database. you can find the app entry inside of the AppInstallations table. i remove this apps here. after the apps will not shown in the content list oder app in $instances = Get-SPAppInstance
-Web ....
I think this is only a bad workaround.
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