Final Fantasy Hacktics

So I am not sure what I did wrong, but I encountered a Bad Sectior? 3716 error and it softlocked on Agrias calling some of the Hokuten knaves rude. Any help would be appreciated.

Edit - nvm, it seems like it only gives the error when I am playing the .cue file.

Am I to assume that you have to be in Act IV in order to get the Agrias Birthday scene to happen or can it be done earlier?