Error "no such material"

[solarray]

I have a simple scene of a studio setup with three mesh lights (light_top, light_front, light_right). All are just simple planes. I gave them a oren-nayar material and enabled light emission. But when I want to render it, indigo says:

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A problem occurred with the scene:
SceneLoaderExcep: No such material 'light_top'
Indigo version: Indigo Renderer v2.4.13, Windows 64-bit build.
Exporter: Blendigo v2.4 Stable, Update 2
Platform: post2008Server 6.1.7600 Multiprocessor Free - Windows 31-PC post2008Server 6.1.7600 AMD64 Intel64 Family 6 Model 15 Stepping 6, GenuineIntel
Author: 31
Description:
Date created: 2010-11-13 13:41:51 GMT
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When I disable the light emission for light_top than the same error occurred with "No such material 'light_front'"

What Im doing wrong ?

[solarray]

Ok I got it. When I enable clay render, than I get this error. Without clay render enabled everything works fine. But isn't this a bug in blendigo, dougal ?

[dougal2]

It could possibly be. Can you attach or PM me the .blend file ?