How to Perform a Client Repair for Nexon Launcher?

This will let you be able to play MapleStory.

If you are launching your game through STEAM:

1. Open your Steam Library.
2. Right-click the game, and then click Properties.
3. Click the Local Files tab.
4. Click Verify Integrity of Game Files to perform the repair installation.
   The validation process begins and any corrupt or missing files are reacquired. ヽ(^◇^*)/

Nexon Launcher

If you are launching your game through NEXON LAUNCHER:

1. Open your Nexon Launcher.
2. From the NexonTag menu, click Launcher Settings.
3. From the left pane, click Game Configure.
4. Select the game.
5. Click Repair Installation.
   A continuation message is displayed.
6. Click OK.
   The repair installation begins. Files that are found to be damaged or missing are downloaded and replaced, as needed.

After the repair installation completes, the play button returns and you can launch the game normally.