If you installed Lumion on an external drive or a non-standard partition (like a D: or E: drive), the plugin might be looking for the "channel" in the default C: drive.

Ensure that the file and the plugin files are on the same local drive if possible.

Check your to ensure that both Lumion and your CAD software have "Inbound and Outbound" rules allowed.

Press . If successful, you will see a confirmation dialog. Summary

Here is a step-by-step guide to troubleshooting and fixing the issue.