This article details Account Center Error 4 occurring in Knives Out (mobile battle royale). Please refer to this for causes and countermeasures when you cannot log in.
Table of Contents
What is Account Center Error 4?
Account Center Error Occurs
Around 22:00 on October 27, reports of "Account Center Error 4" occurring and preventing game login were successively posted on SNS and other platforms.
Countermeasures
After the error occurs, you can try restarting the game or waiting a bit. However, if there's an official announcement like this time, you'll have to wait for the recovery announcement.
Impact of the 5th Anniversary Event?

It's possible that the access concentration is due to the 5th Anniversary event, which started on October 27. Events such as the distribution of Bind Gold Vouchers and opportunities to obtain permanent Gold-tier items are being held, increasing user attention.
Current Status
Account Center Error Restored
Currently (around 22:20 on October 27, 2022), it is reported as fixed. The login unavailability issue is reportedly still being fixed.
(October 28, 18:00) 91% login unavailable bug fix completed and announced.