Can't Sign In

I bought the game directly from the PSN Store around Decmember 2013 and after about two weeks I couldn't play due to IRL issues. Recently (yesterday), I tried to sign in but I am greeted with an invalid message and a notice from early August, saying for particpants to register before August 30th. I believe it might be because I havent renewed my account subscription but if it is something else I'd rather not spend money to renew my account and then not be able to sign in. SO is it because I need to renew or is it something else?