ROB RUN Error Codes: E-0101 and More

In short

Codes starting with E-01 are about connection and data; E-03 — an old or mismatched game version.
E-04 is login through Steam or Epic Online Services; E-05 — the anti-cheat.
For most codes the first move is: restart the game from Steam and verify the game files.
If the code repeats after that, write to the Kefir Help Center and quote it.

Code	What it means	What to do
E-0101 / E-0110	Configuration server or startup data unavailable	Check your internet connection
E-0102	Data corrupted or blocked (public Wi-Fi, antivirus)	Home network without a login page; disable proxy; pause antivirus HTTPS scanning
E-0124	Internal asset loading error	Steam → Verify integrity of game files
E-0201	Connection to the game server lost and not restored	Check connection; restart the game
E-0301 / E-0302	Outdated game version	Close the game; restart Steam; update
E-0303 / E-0304	Data corrupted or mismatched with the version	Wait 10–15 minutes; disable proxy; verify files; update
E-0401	Steam authentication error	Steam online on the correct account; restart
E-0403 / E-0404	Epic Online Services authorization issue	Verify files; add the game to antivirus exclusions; reboot the PC
E-0405	Steam not responding / antivirus blocked a system library	Check antivirus quarantine; launch Steam; verify files; launch from the library
E-0501 / E-0502	EAC not running, corrupted or blocked	Launch only through Steam; disable antivirus; verify files; reboot the PC
E-0601	Keyboard/mouse not detected (Remote Desktop, cloud streaming)	Connect physical devices before launching; avoid remote sessions
E-0904	Unexpected internal error	Restart; if it repeats — send the error text to support

The groups and their reading come from the game and the Kefir Help Center; the “what to do” column is the shortest fix they give.

Close the game and restart Steam.
Launch the game from the Steam library, not from a shortcut.
In Steam: right click the game → Properties → Installed Files → Verify integrity.
Turn off the VPN, the proxy and the overlays; add the game to the antivirus exclusions.
Restart the computer and try again.

More cases — launch warnings, crashes and settings — are in launch warnings and AVX2, crashing and the full troubleshooting table.