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If you’re a fan of Umamusume Pretty Derby, chances are you’ve run into the frustrating Error Code 390, which comes with a message like “There was a connection error. Error Code 390.” Whether you’re playing on mobile or PC, this issue can suddenly stop you from enjoying your races and training sessions. Fortunately, this guide walks you through step-by-step solutions that have helped other players fix the issue and get back in the game.

🔍 What Causes Umamusume Pretty Derby Error Code 390?

Error Code 390 typically indicates a connection issue, which can be triggered by:

  • An unstable or blocked internet connection
  • Conflicting installation folders (especially if using both Steam and DMM versions)
  • VPN interference
  • Background processes that didn’t close properly
  • Corrupted game files

Let’s walk through all the practical solutions below.

✅ 1. Fully Restart the Game

The most basic but surprisingly effective fix is to restart the app completely.

  • On Mobile: Close the game from recent apps and reopen it.
  • On PC:
    • Press Ctrl + Shift + Esc to open Task Manager.
    • Look for any running processes of Umamusume Pretty Derby under the Apps section.
    • If found, right-click on it and select End Task.
    • Relaunch the game to check if the error is gone.

✅ 2. Switch to a Different Network

A poor or unstable internet connection can trigger the 390 error.

  • Try switching from Wi-Fi to mobile data (hotspot) or vice versa.
  • If you’re on a shared network, consider using a personal connection to avoid firewalls or restrictions that may interfere with the game servers.

✅ 3. Rename Your DMM Folder (PC Users)

If you’ve previously installed the DMM version and are now trying to use the Steam version, file overlap may be the problem.

Fix:

  • Locate the folder where your DMM version is installed (commonly named something like Umamusume).
  • Rename the folder to something else, like Umamusume_DMM_Backup or UmaMuseum1.
  • This prevents conflict between DMM and Steam files.

This step ensures the Steam version has its own separate environment to run without crashing or clashing.

✅ 4. Disable VPN Services

Some players use VPNs to access content, but these can interfere with server connections.

  • Temporarily disable your VPN and try launching the game again.
  • If the game works without a VPN, that’s likely the source of the issue.

Also, make sure you are not using a VPN server in a restricted country, which may block or throttle game traffic.

✅ 5. Reinstall the Game

If none of the above solutions work, it may be time to reinstall the game:

  • Delete the game completely.
  • Make sure to clear cache and leftover folders (especially on PC).
  • Re-download the latest version from your respective platform (Steam, DMM, or mobile app store).

This ensures you’re working with fresh, non-corrupted files.

✅ 6. Contact Support via Discord

Still stuck? Don’t worry — the Umamusume community has an official support system via Discord.

Here’s how to get help:

  • Join their official Discord server (usually called Pretty Derby or similar).
  • Navigate to the #help or #support channel.
  • Follow instructions to open a support ticket.
  • Provide screenshots and a description of the issue (Error Code 390).
  • A staff member will respond to help you troubleshoot further.

Note: The link to the Discord server is typically found in the official game announcements, or community forums.

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