If you're getting the 315300 error, incorrect password/account than you're most likely pasting in your password. Here's the fix: type your password out in a word program, like notepad. Copy it from notepad and paste it in the game. If you got the 315300 error beforehand from copying the password ingame then pasting it and going you are just copying asterisks and not the actual characters.
Copy from wordpad > Paste in game > Wait a few hours for servers to unclog