How do I fix MapleStory error code -40?

Alton Alexander
By Alton AlexanderUpdated on June 4th, 2022

The maplestory error code -40 is a error that can occur when trying to launch the game. This error is usually caused by an incorrect installation of the game or by a corrupt game file.

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1. Restart your computer and try again

  1. Restart your computer.
  2. Press the "F8" key repeatedly when the computer starts up.
  3. Select the "Advanced Options" menu.
  4. Select the "Restart" option.
  5. Choose the "Local Machine" option.
  6. Click on the "Restart" button.
  7. Choose the "Yes" option when the computer asks if you want to restart in Safe Mode.
  8. After your computer restarts, try to log in to your account again.

2. Update your graphics drivers

  1. Open Device Manager by right-clicking on My Computer and choosing Manage.
  2. In the Device Manager window, select Display Adapters.
  3. Right-click on the graphics adapter that you are using and choose Update Driver.
  4. In the Update Driver window, browse to the location of the latest graphics driver and select it.
  5. Click OK to start the update process.
  6. If the update process is successful, you will see a message stating that the update was successful.
  7. If the update process is not successful, you will see a message stating that the update failed.
  8. You can try using the latest graphics driver again by following the steps in step 4.

3. Verify your game files

The Verify your game files in order to fix maplestory error code -40 process begins by verifying your game files for errors. If there are any errors, they will need to be fixed before the game can be played. After the game files have been verified, the next step is to fix any errors that have been found. This will require either downloading patch files or fixing the errors through manual intervention. If the errors cannot be fixed, the game may need to be reinstalled.

4. Delete your MapleStory folder and reinstall the game

  1. Launch MapleStory and sign in.
  2. Click the "Options" button in the upper-left corner of the main screen.
  3. Click the "Storage" button.
  4. Select the "MapleStory" folder.
  5. Click the "Delete" button.
  6. Click the "Reinstall" button.
  7. Enter your account password and click the "Install" button.
  8. Launch the game and sign in.
  9. Click the "Options" button in the upper-left corner of the main screen.
  10. Click the "Account" button.
  11. Click the "Maplestory" folder.
  12. Click the "Delete" button.
  13. Click the "Reinstall" button.
  14. Enter your account password and click the "Install" button.

5. Run MapleStory in compatibility mode

  1. Launch MapleStory from your computer.

  2. Click on the "Options" button in the upper-left corner of the game window.

  3. Click on the "Compatibility" button.

  4. Select "Run in compatibility mode."

  5. Click on the "Apply" button.

  6. Click on the "OK" button.

  7. Click on the "Play" button.

  8. If you encounter any errors while playing the game, try to fix them by following the steps below. a. If you are experiencing an error code -40, try to fix it by following these steps:

  9. Make sure that your computer is running the latest version of MapleStory.

  10. Make sure that you have the latest updates for MapleStory installed.

  11. Make sure that your antivirus software is not blocking MapleStory from running.

  12. Try to restart your computer.

  13. Try to clear your browser cache and cookies.

  14. If you are still experiencing errors, try to contact Customer Support.

6. Turn off your antivirus software temporarily

  1. Open the Windows Start Menu and click on "Control Panel."
  2. In the Control Panel window, double-click on "Security and Maintenance."
  3. In the Security and Maintenance window, click on "Antivirus."
  4. In the Antivirus window, click on "Turn Off."
  5. In the Turn Off Antivirus window, click on "Yes."
  6. Close the Security and Maintenance window.

If the answers above didn't work then you should also try:

  1. Add MapleStory to your firewall exceptions list.
  2. Contact MapleStory customer support.