I was able to catch the error here is PrintScreen.I need more detailed info about what you do when you get this message, and the message itself copied exactly how it is. The content of Maya console window will be very helpful to catch the reason of it (with "Verbose mode" enabled in Octane render settings) - you may just post the screenshot if the console has not many messages...
It was happened when I opened the scene. Texture dont displayed in vewport. Its happend with large images textures(4k) in JPG format if change it in PNG octane dont print this error message