This error indicates that you are trying to log into Skyforge with a PSN account that does not have one of the Early Adopter Packs purchased. 

 

During the Early Access phase of Skyforge, only users that purchase one of these packs will receive access to the servers. Please ensure that you are logged in with the correct account on your PlayStation. 

 

If you accidentally changed PSN account, simply switch back to the user that purchased the packs, and play the game from there.