Once resolved, adopt these best practices to ensure "Channel not found" never returns:
Missing or corrupted system-level software can also cause load routine failures.
When the error appears, Lumion typically defaults to "Performance" or "Speed" modes. You will notice:
Sometimes the "channel" is actually there, but the software doesn't have the permission levels required to "see" or access it. Right-click the Lumion shortcut and select "Run as Administrator."