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Check out the v.258 - MapleStory x Demon Slayer: Kimetsu no Yaiba Patch Notes
here!
v.180 – V: Champions Patch Notes
Comments
Typically this happens when the launcher update occurs and is canceled before maintenance is over. If you use the GameLauncher.exe located in your game files, you should be able to log in just fine. A full system restart after logging in via GameLauncher should be enough to fix it, and if it doesn't then it should go back to normal once the launcher finishes downloading.