Game tells me that my account password is wrong or "doesn't exist."

Hello all! I've returned to good ol' Gamezbd after a year or so, and I have updated my launcher to the up-to-date client. I login using the same account I've started on. I click the "start" button only for the game to tell me that "Account does not exist or the password is incorrect." Which doesn't make any sense...since on the launcher, I sign in and it goes in smoothly, no errors of the sort. I don't really get why the game is telling me this. I have ran it as Admin, it's still excluded from the security programs and I even uninstalled/reinstalled it to see if that fixes it, and it still tells me that my password is wrong or that my account doesn't exist. What I really don't get or understand is that if my password is "wrong" then I wouldn't be able to login to the Gamez Launcher, yet I am, and if it didn't "exist" I wouldn't even be able to login squat. So I don't really get what the game thinks is "wrong" here. Any help will be appreciated.