Run the Lumion_Installer.exe again. It should detect the existing installation and offer a Repair option.
Sometimes the error is transient due to a background process locking a file.
The error is a critical startup failure that prevents Lumion from launching. It indicates that Lumion’s executable engine cannot access or verify its core internal program channels, often accompanied by secondary crashes like StyleTransfer.dll errors.
: Interrupted updates or installation processes can lead to missing cached files.
When you open Lumion, it looks for those quarantined files to load its functions. Because the files are missing, Lumion throws the "Channel not found" error, effectively replacing the specific file name (like System_Command.dll or StringOperator.dll ) with the generic error code.
Lumion’s legacy code (pre-v12) has difficulty with non-English characters. If your Windows username contains accented characters (e.g., "José", "Müller") or if you installed Lumion in a folder with spaces or symbols (e.g., C:\Lumion 12\ is fine, but C:\Lumion★\ is not), the channel loader cannot parse the path.
Windows Defender and third-party AVs (Avast, McAfee, Bitdefender) are notorious for deleting Lumion channel files.
Open the Windows Start menu, type Windows Security , and open the app.
Bookmark this article. Lumion updates every few months, and with each update, the "channel not found" error has a habit of resurfacing. Now you know exactly how to banish it for good.
Many users find that their antivirus (including Windows Security/Defender) has deleted or quarantined the necessary files during or after installation 1.2.1.
If your error specifically references or AIEffects.cgr , it is likely a direct result of a Windows conflict with the onnxruntime.dll library. Ensure Lumion is completely closed via your Task Manager.
Run the Lumion_Installer.exe again. It should detect the existing installation and offer a Repair option.
Sometimes the error is transient due to a background process locking a file.
The error is a critical startup failure that prevents Lumion from launching. It indicates that Lumion’s executable engine cannot access or verify its core internal program channels, often accompanied by secondary crashes like StyleTransfer.dll errors. Run the Lumion_Installer
: Interrupted updates or installation processes can lead to missing cached files.
When you open Lumion, it looks for those quarantined files to load its functions. Because the files are missing, Lumion throws the "Channel not found" error, effectively replacing the specific file name (like System_Command.dll or StringOperator.dll ) with the generic error code. The error is a critical startup failure that
Lumion’s legacy code (pre-v12) has difficulty with non-English characters. If your Windows username contains accented characters (e.g., "José", "Müller") or if you installed Lumion in a folder with spaces or symbols (e.g., C:\Lumion 12\ is fine, but C:\Lumion★\ is not), the channel loader cannot parse the path.
Windows Defender and third-party AVs (Avast, McAfee, Bitdefender) are notorious for deleting Lumion channel files. When you open Lumion, it looks for those
Open the Windows Start menu, type Windows Security , and open the app.
Bookmark this article. Lumion updates every few months, and with each update, the "channel not found" error has a habit of resurfacing. Now you know exactly how to banish it for good.
Many users find that their antivirus (including Windows Security/Defender) has deleted or quarantined the necessary files during or after installation 1.2.1.
If your error specifically references or AIEffects.cgr , it is likely a direct result of a Windows conflict with the onnxruntime.dll library. Ensure Lumion is completely closed via your Task Manager.
