1. Restart Lumion and Your Computer
- Sometimes, a simple restart can resolve the issue. Close Lumion, wait for a few seconds, and then reopen it. If the problem persists, try restarting your computer.
Step 1: The "Run as Administrator" Test
Many permission-related instances of this error vanish when you elevate privileges.
What this usually means
- A required file, plugin, or installation registry entry is missing, corrupted, or blocked.
- A recent update, incomplete installation, or third‑party tool (antivirus, system cleaner) removed or quarantined files.
- Permission issues or mismatched versions between Lumion and dependent components (graphics drivers, Visual C++ redistributables, DirectX).
- Conflicts with custom libraries, third‑party plugins, or corrupted user profile settings.
: Certain Windows 10/11 updates can introduce library conflicts (like onnxruntime.dll ), which may trigger similar "Channel not found" errors. Corrupted Installation
Step 7: The "Channel" File Replacement (Advanced Users)
If you know exactly which channel is missing (the error message may reveal a filename, e.g., ReflectionChannel.dll), you can try to replace it: