Hi, I wonder if someone can point me in the right direction...

I have the following loop:

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 #while(X<=18)
  box {
   <-0.2, 0, 0.05>, <0.2, 0.1, -0.05>
   pigment {
    color rgb <0.75,0.75,0.75>
   }
      #debug concat(str((X), 3, 3), "\n")
      Spline_Trans(path, (X), y, 0.1, 0.5)
   //translate path(X)
  }
  #declare X=X+0.001;
 #end
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to draw a "rail" that _should_ bank with the object that's going to follow 
the rail. The Spline is defined from -2 to 20 and is a cubic_spline. If I 
use transform, I get a nice circuit, however, when I try to use 
Spline_Trans, I get:
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....
1.316
1.317
1.318
File: <path>\Rollercoaster\Scene.POV  Line: 91
File Context (5 lines):
      #debug concat(str((X), 3, 3), "\n")
      Spline_Trans(path,
Parse Error: Identifier expected, incomplete function call or spline call 
found instead.
Total Scene Processing Times
  Parse Time:    0 hours  0 minutes  0 seconds (0 seconds)
  Photon Time:   0 hours  0 minutes  0 seconds (0 seconds)
  Render Time:   0 hours  0 minutes  1 seconds (1 seconds)
  Total Time:    0 hours  0 minutes  1 seconds (1 seconds)
CPU time used: kernel 0.73 seconds, user 0.50 seconds, total 1.23 seconds

POV-Ray finished
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Any help greatly appreciated.

oh and my includes:
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#include "colors.inc"
#include "textures.inc"
#include "metals.inc"
#include "golds.inc"
#include "stones.inc"
#include "woods.inc"
#include "shapes.inc"
#include "shapes2.inc"
#include "functions.inc"
#include "math.inc"

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