“Cairn Failed to load il2cpp” error also known as “Fatal error: Failed to load il2cpp” is one of the most common crashes on PC. Usually, this crash is linked to Windows Defender or antivirus falsely flagging Cairn’s game files. Cairn is developed on Unity 6, and this engine often gets flagged by Windows Defender. There is an easy fix for Cairn Failed to load il2cpp crashing on PC, all you need to do is turn off Small App control.
Before you try more advanced fix for this, I recommend running some basic troubleshooters that often fix the problem.
- Verify game files
- Update GPU drivers
Disable Smart App Control (Most Effective for Cairn)
The game developer has confirmed this often resolves the il2cpp error. Here’s what you need to do:
- Press Windows key + I to open Settings.
- Go to Privacy & security → Windows Security.
- Click App & browser control.
- Under Smart App Control, select Off (or “Off – Not recommended” if prompted).
- Restart your PC.
Once the Smart App control is off, run Cairn as administrator. If that fixes the problem, great, but if not then you need to add Cairn to Antivirus Exclusion. Windows Defender or third-party antivirus often quarantines GameAssembly.dll or other IL2CPP files.
- Open Windows Security → Virus & threat protection → Manage settings.
- Scroll down to Exclusions → Click Add or remove exclusions.
- Add Cairn the complete game folder
Also turn off real-time protection and then relaunch the game. Cairn should now run without crashing into Failed to load il2cpp error.
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