Hi Jeroen. Have you extracted the AC library into your file system? If not, there will not be a "Gras 06 GS.jpg" in the file system - it will be encoded in the lcf library where Octane cannot access it. http://render.otoy.com/manuals/ArchiCAD/?page_id=169. The plugin should pop some sort of message when this occurs. Have you checked the Octane Log?