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ROB RUN · Error codes · Updated Nov 15, 2026

ROB RUN Error Codes

Got an error when you start or play ROB RUN? Type the code below to see what it means and how to fix it. All 17 codes come from Kefir's help center.

Image: Kefir (Steam)
E-0101E-0110Connection

The game cannot reach the server to get its settings or startup data.

  1. Check that your internet works and websites load.
  2. Restart the game and Steam.
  3. If many players have the same error, the servers are probably down: wait and check Kefir's Discord.
E-0102Connection

Game data is blocked or damaged on the way, often by hotel, school or office Wi-Fi, a proxy or VPN, or antivirus HTTPS scanning.

  1. Switch to your home network or a phone hotspot.
  2. Turn off any proxy or VPN.
  3. Pause HTTPS / web scanning in your antivirus as a short test.
E-0124Game files

Internal error while loading game assets.

  1. Verify the game files: Steam Library, right-click ROB RUN, Properties, Installed Files, Verify integrity.
  2. Restart the game.
E-0201Connection

The connection to the server was lost and could not be restored.

  1. Check your connection; a wired connection is more stable.
  2. Restart the game.
  3. If it happens to everyone, the server is unstable: wait a few minutes.
E-0301E-0302Game files

Your game version is outdated.

  1. Close the game.
  2. Restart Steam so it downloads the update.
  3. Launch the game again once the update is done.
E-0303E-0304Game files

Corrupted or mismatched game data.

  1. Wait 10 to 15 minutes and try again.
  2. Turn off any proxy or VPN.
  3. Verify the game files and update the game.
E-0401Account

Steam authentication failed.

  1. Make sure Steam is online and you are signed in.
  2. Restart Steam, then the game.
E-0403E-0404Account

Problem signing in to Epic Online Services, which the game uses in the background.

  1. Verify the game files.
  2. Add ROB RUN as an exception in your antivirus.
  3. Restart your PC.
E-0405Account

Steam is not responding, or your antivirus blocked a game library.

  1. Check your antivirus quarantine and restore any ROB RUN file.
  2. Open Steam first, then start the game from your Library.
  3. Verify the game files.
E-0501E-0502Anti-cheat

Easy Anti-Cheat is not running, is damaged, or was blocked.

  1. Launch the game from your Steam Library, not from a shortcut to the .exe.
  2. Pause your antivirus briefly as a test, then add an exclusion.
  3. Verify the game files and restart your PC.
E-0601Input

No keyboard or mouse detected. This often happens in remote desktop or cloud PC sessions.

  1. Plug the keyboard and mouse in before you start the game.
  2. Play on the PC itself, not through a remote or cloud session.
E-0904Other

Unexpected internal error.

  1. Restart the game and Steam.
  2. If it keeps happening, send the exact error text, your UID and a screenshot to Kefir support.

No error code, but the game still will not start?

Stuck on "Compiling Shaders", crashing on startup or unable to enter your house? Those problems often come from the servers, not your PC. Our ROB RUN crash and not launching guide covers each one step by step. FPS drops when you move the mouse? See ROB RUN Best PC Settings.

Source: Kefir help center (troubleshooting and error codes), as summarised by Windows Forum. Last checked November 15, 2026.

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FAQ

What is error E-0501 in ROB RUN?

Easy Anti-Cheat is not running or was blocked. Launch the game from your Steam Library, pause your antivirus briefly as a test, verify the game files and restart your PC.

What does E-0102 mean in ROB RUN?

Game data is being blocked, usually by public Wi-Fi, a proxy or VPN, or antivirus HTTPS scanning. Use your home network and turn those off.

How do I fix E-0101 in ROB RUN?

The game cannot reach the server. Check your internet and restart the game. If many players get it at the same time, the servers are down: wait.

What if my error code is not in the list?

Restart the game and Steam, verify the game files and update your graphics driver. If it keeps happening, send the error text, your UID (press Esc, it is under your character name) and a screenshot to Kefir support.