problem with uniforms

god.glsl

#version 400

/* vertex attributes */
in vec3 sky_co;
//in vec4 sky_color;                                                                                                                    

/* uniforms */
uniform mat4 sky_view;

/* out */
smooth out vec3 point;
flat out vec3 eye;

smooth out vec4 icolor;

void main() {
    mat4 inv_view = inverse(sky_view); /* screen-space -> world-space */
    //icolor = sky_color;                                                                                                               
    gl_Position = vec4(sky_co, 1.0);
    point = (inv_view * vec4(sky_co, 1.0)).xyz;
    eye = inv_view[3].xyz;
}