[.NET/C#] Lighting Problems

[ArcAngel]

This code:

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NodeLight1 = Dev.SceneManager.AddLightSceneNode(null, new Vector3D(0, 25, 0), new Colorf(0.065f, 0.065f, 0.075f, 0.0f), 25f, -1);
            
Irrlicht.Video.Light light = NodeLight1.LightData;

light.DiffuseColor = new Colorf(0.75f, 0.75f, 0.8f);
light.SpecularColor = new Colorf(0.25f, 0.25f, 0.2f);

NodeLight1.LightData = light;

works very well when i debug this code within Visual Studio 2005, but when i compile my program, the Application closes immediatelly after doubleclicking it. If i comment out the special Light options and use just the first line, all works very well, but looks ugly.

what do i wrong?

im currently using Irrlicht 1.2 and the .NET Wrapper from here

pls excuse my bad english, its quite rusty