2XKO Critical Error | Likely Cause and Fixes

It seems you’re encountering a “critical error” with the game 2XKO, a new fighting game from Riot Games. This is likely related to Vanguard, Riot’s anti-cheat software, which is also used in games like League of Legends and VALORANT.

Here’s what you need to know and how to troubleshoot it effectively.

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Likely Cause & Community Fixes

Though Riot hasn’t documented a specific “critical error” code, user reports on Reddit offer valuable insights. One player shared a resolution that worked:

“I was getting this critical error message… What I did was:

1. Closed every overlay third party software, Riva turner (RTSS) was active in the background so I disabled it.

2. Added the Riot Games folder to the exception list on Windows defender.

3. I checked ‘disable full screen optimizations’ and ‘Run this program as administrator’ in the compatibility settings of the game shortcut icon.

4. I Right clicked the game icon and ran as administrator…”

Another popular fix for related issues, such as black screens, involves adjusting compatibility settings:

“Right‑click the 2XKO shortcut > properties > under ‘Compatibility mode’ and untick ‘Run this program in compatibility mode for:’. Doing this should fix the issue!”

These steps have helped many users bypass initialization issues that might surface as critical errors.

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Step-by-Step Troubleshooting Guide

Here’s a consolidated checklist to resolve critical launch errors:

1. Close all overlay or recording apps

   • This includes tools like RivaTuner (RTSS), Overwolf, Discord overlay, etc.

2. Shield Riot Games from antivirus interference

   • Add the entire Riot Games folder (including 2XKO and Riot Client) to your Windows Defender or third-party AV exclusions.

3. Adjust compatibility settings on the game shortcut:

   • Right-click the shortcut → Properties → Compatibility tab

   • Uncheck Run this program in compatibility mode

   • Check Disable full-screen optimizations

   • Check Run this program as administrator

   • Apply changes

4. Fully close the Riot Client

   • Ensure it isn’t running in the background via Task Manager before launching the game.

5. Attempt launch again — run the game as administrator.

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What If It Still Doesn’t Work?

Gather Error Logs

Documenting the issue with real data can greatly help with support requests:

• 2XKO Logs:
  C:\Users\<you>\AppData\Local\Lion\Saved\Logs\Lion.log and backup files

• Riot Client Logs:
  Under C:\Users\<you>\AppData\Local\Riot Games\Riot Client\Logs

• Vanguard Logs:
  Found in C:\Program Files\Riot Vanguard\Logs

Include system logs like Process List and DirectX Diagnostic, if possible.

Submit a Bug Report to Riot

If your issue persists after trying the fixes:

• Reference the Known Issues & Solutions section to see if your problem is covered.

• If it’s not, submit a bug report—include error details, logs, screenshots/video.

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Quick Recap