Right-click the installer payload named and select Run as Administrator . Select the Repair option on the prompt interface.
The "channel not found" error is usually a symptom of a missing file, which is most often caused by aggressive antivirus software. By setting up proper exclusions in your security software and ensuring all redistributable packages are repaired, you should be able to resolve the issue and get Lumion running smoothly 1.2.1.
If you are seeing this popup—likely alongside another error mentioning a file like StringOperator.dll or StyleTransfer.dll —don't worry. You haven't lost your project, and your graphics card likely isn't broken. This error is a well-known software conflict with several specific, tested fixes available from Lumion experts and the official support team. Right-click the installer payload named and select Run
Run Lumion installer → select Repair option.
While less common, outdated or corrupt GPU drivers can cause general instability and load errors in Lumion. Lumion has a hard requirement for recent drivers to function correctly. By setting up proper exclusions in your security
If you recently updated your CAD/BIM software (e.g., upgrading to the latest version of Revit or SketchUp), an older LiveSync plugin will fail to locate the newer software paths. Completely close your 3D modeling program.
Follow these verified diagnostic steps sequentially to resolve the startup failure without resorting to a full software uninstallation. This error is a well-known software conflict with
If you see any duplicates or leftover instances when the programs are supposed to be closed, right-click them and select .