# Troubleshooting

### Instance "acme" is not existing

Login screen of Reef app is refusing to let you in Atollon after upgrading to new generation Atollon backend.

#### Solution

Clear locally stored data, in Safari go to **Settings** > **Privacy** > **Manage Website Data**

[![remove-local-data.png](https://help.atollon.com/uploads/images/gallery/2025-10/scaled-1680-/Bicgs59TbFRP7Fqo-remove-local-data.png)](https://help.atollon.com/uploads/images/gallery/2025-10/Bicgs59TbFRP7Fqo-remove-local-data.png)