Error prior to using GLSL Program Object : ...

[hall]

Take a look below. I attach it say to a cube and it works. But my log gets spammed with "Error prior to using GLSL Program Object : invalid operationValidation successful." If it's referring to "validation" of the shaders, the log says " Vertex Program:DepthMapVS Fragment Program:DepthMapFS GLSL link result : Validation successful." What gives?

Thanks,

M

Material Declarataion

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material DepthMap {
    technique
    {
        pass
        {
            lighting off
            
            vertex_program_ref DepthMapVS
            {
            }
            
            fragment_program_ref DepthMapFS
            {
            }
        }
    }
}

Shader declarations:

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vertex_program DepthMapVS glsl
{
    source depthMap.vs
    
    default_params
    {
//        param_named_auto worldMat world_matrix
    }
}

fragment_program DepthMapFS glsl
{
    source depthMap.fs
    
    default_params
    {
//        param_named_auto camPos camera_position
    }
}

Simple white frag shader:

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void main() {
    gl_FragColor = vec4(1, 1, 1, 1);
}

Simple vertex shader

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void main() {
    gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;
}