Well, you just have a finish statement hanging out in the middle of nothing.

If you wrap it in a default {} block, or apply that finish to your box by moving
inside the box {} statement's brackets, then all should be fine.

I incorporated both ways (plus newer requisite version and gamma) into the
following scene.

#version 3.8;

#include "colors.inc"
#global_settings {assumed_gamma 1.0}

#default {
 finish {
  reflection 0
  ambient 0.1
  specular 0.4
 }
}

camera {
 location <-14,5,15>
 look_at <0,0,0>
}

light_source {
 <4,7,8>
 White
}

sky_sphere {
 pigment {
 gradient y
  color_map {
  [0 color White]
  [1 color DarkTurquoise]
  }
 scale 2
 translate <0,1,0>
 }
}

box {
 <0,0,0>,<-3,3,3>
 pigment {
  rgb 1
 }
 finish {
  reflection 0
  ambient 0.1
  specular 0.4
 }
}


Hope that helps.

- BE

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