Try launching Lumion again after closing these.
Follow these solutions in order. Test Lumion after each step. lumion failed to create dummy d3d9
: Some users find relief by increasing Windows Virtual Memory (paging file size) to at least 100,000 MB if system RAM is low. For persistent issues, official support suggest using Display Driver Uninstaller (DDU) Try launching Lumion again after closing these
Modern GPU drivers (NVIDIA Studio / Game Ready, AMD Adrenalin, Intel Arc) contain user-mode D3D9 drivers. If the driver installation was interrupted, or if remnants of an old driver remain, the D3D9 runtime may attempt to load a mismatched or missing driver component. lumion failed to create dummy d3d9