You are seeing this error because the view //app/views/pages/function.unserialize.thtml for action function.unserialize in controller Pages could not be found.
Notice: this error is being rendered by the app/views/errors/missing_view.thtml
view file, a user-customizable error page for handling missing/invalid views during rendering.
Fatal: Unable to load view file //app/views/pages/function.unserialize.thtml for action PagesController::function.unserialize()