Did you use an old save or jump straight to act 2? This errir is usually caused from outdated save files
Probably saves from ages ago, first I played was around release or so.
Do you recommend I start all over again? Grinding it all over sounds like a work out when looking back at act 1.
Edit: Just realized you can start out from different acts. This is quite the feature. Kudos!
Appreciate the support as well!