Ignore it. Do not reinstall. Wait for the next Lumion patch.
To restore your Lumion workflow to its high-quality standards without a full reinstallation, follow these troubleshooting chapters: Ignore it
When Lumion tries to load a material, texture, or effect, it looks for these pre-mapped channels inside its core installation folders (usually within C:\Program Files\Lumion [Version]\ ). The error "Channel not found... skipping load routine" indicates that Lumion is looking for a specific data stream that either: Ignore it
: Missing or corrupted system files can prevent routines from loading. Ignore it