Fatal Error: SceneLoaderExcep: No 'spectrum' element found i

[Eric]

Hello,
when I try to run an exported XML-file, generated in Blender 2.42a, in Indigo v.0.6, I always get the following error-message:

Fatal Error
SceneLoaderExcep: No 'spectrum' element found in background element.

I use the Indigo 0.5test7 export script in Blender

When I try to delete the background-tag in my XML-files, the error-message doesn't appear anymore, but indigo.exe crashes when it tries to render.

indigo.exe has encountered a problem and needs to close. We are sorry for the inconvenience.

AppName: indigo.exe AppVer: 0.0.0.0 ModName: indigo.exe
ModVer: 0.0.0.0 Offset: 0000ffa1

I'm new to Indigo and I followed the tutorial on http://www.indigorenderer.com/blender_tut/. This didnt'work too.

Does anybody have an idea what the problem could result from?

[atmmatt]

I get the spectrum problem when I either don't have a proper light sources. Do you have a sun light source? Maybe you have multiple suns. I also notice using the latest exporter I have to use sunsky and background won't work (maybe I need a background or something, exr?).