Photon emission shader returned miFALSE: aborting photon tracing

[smokedogg]

Has anyone had this problem when rendering a maya mental ray scene with a portal light. I keep getting this error in my output window and have no clue why: error: photon emission shader returned miFALSE: aborting photon tracing. Any help would be great. Thank you.

[joojaa]

Well the 2 reasons ive ever seen this is: Your shader has either no photon shader associated with it. Or a shader that can not act on photon transmission is attached to it. OR the sahder bugs up in some other way contact the creator of the shader for further info.