This message appears when using the 3ds Max Falloff map in “Shadow/Light” mode, which is not supported by Corona. This feature, being non-realistic, would cause issues in photorealistic renderers such as Corona. Only the color or map used in “shaded” slot of the falloff map will be used.
Falloff map in "Shadow / Light" mode
Possible causes:
There is a Falloff map in “Shadow/Light” mode present in the scene.
Solutions:
Remove offending Falloff map, or set its falloff mode to some of the supported modes.