Please make sure you have the free Witcher 3 DLCs downloaded from PlayStation Store (list below). After installing them please give it a try to launch the gamesave that couldn't be previously loaded.
1. Temerian Armor Set
2. Beard and Hairstyle Set
3. New Quest – ‘Contract: Missing Miners’
4. Alternative Look for Yennefer
5. Nilfgaardian Armor Set
6. Elite Crossbow Set
7. New Quest – ‘Fool’s Gold’
8. Ballad Heroes’ Neutral Gwent Card Set
9. New Quest – ‘Scavenger Hunt: Wolf School Gear’
10. Alternative Look for Triss
11. New Quest – ‘Contract: Skellige’s Most Wanted’
12. Skellige Armor Set
13. Alternative Look for Ciri
14. New Quest – ‘Where the Cat and Wolf Play…’
15. New Finisher Animations
16. NEW GAME PLUS