If you are getting this error then then the app is no longer published and active.
To check if the app is online:
1. Open your StickyApps Account
2. Select the Apps Tab
3. Click Edit next to the app that you wish to update.
4. App detaild - change the stauts from private (draft) to public (visable to anyone with the link).
5. If the app is still not working correctly.