Today, some players have a problem logging in the game after the scheduled maintenance. Most of these players gets a black screen saying “Login is Crowded, Please Try Again”.
However, Ragnarok M Eternal Love announces to their FB page that the server maintenance will be delayed by an hour and player should wait for further updates. This might be the reason why player gets the black screen.
The error is probably something to do with the lags in the server as many players are now logging in the game after the 4 hours server maintenance.