I installed an app to my hardrive and I decided I don't want the app anymore. I tried to trash the app and a message popped up saying, "Cannot move app to trash because it cannot be deleted". What else can I do to delete the app from the hard drive?
Plus, make sure the file/App is not locked (do a Get Info on it). The Get Info will also let you change the permissions on it (if you are Admin) so you can Trash it.