This message will appear if you are trying to open C-Cloud while you are logged in to another user account, which is not the administrator user account where you have installed C-Cloud.
However, even though you will not be able to open C-Cloud from this user account you are logged in to, C-Cloud will still be running and backing up your data at the scheduled time. So, when you log in to the administrator user account, you will notice that the backup did not stop.