About pach_rt on the pachyderm plug-in

I’m using a plugin called pachyderm right now, but in pach_rt

  1. Raytracing operation failed. This can be due to an unsuitable scene object. For example, did you set materials on all layers referenced by Rhinoceros Geometry?

I keep getting this error, but I’ve already assigned the material to the layer. How do I handle it?

Thank you. @Author