OpenGL glLightfv parameters

[Ruku]

Having a few problems with OpenGL's glLightfv function,

I sent:

glLightfv(GL_LIGHT1, GL_AMBIENT, LightAmbient)

with LightAmbient being an array of float containing { 0.5, 0.5, 0.5, 1.0 }
(edit: these values correspond to x,y,z, alpha)

and I receive error message:

"Error 1 Overloaded method 'CsGL.OpenGL.OpenGL.glLightfv(uint, uint, float*)' has invalid arguments"

using csgl.dll from Lloyd Dupont <[email protected]>, 2001
ver 1.4.1.0

All samples over the internet make the use of the array fine... so I'm having a hard time find the problem on my arguments...

thanks for helping...

(edit: sry if not appropriate for this topic, please move to Games and Graphics Programming)