[CLIENT] Another Black Screen Client Error

It seems similar to the client error that happened around 4 months ago. Up to the login screen it's fine, but right after all it shows is a black screen. Then, after I wait a few seconds a message that says, "There was an unexpected error with the login session. Please try again." I tried using the previous solution 4 months ago which was press the "X button" before the error message popped up and pressing "Sign Out." However, this time the only options I have when pressing the "X button" are "Yes" and "No" to the question, "Are you sure you want to exit League of Legends?" I do have a picture, but I'm not sure how to upload it here. Please help!

Edit: Worked after doing a full shutdown. It's all gucci yall.