problem while encap using NSIS

[mohamed aly]

when i want to encap my rebol scripts using NSIS ,it always fails according to fail NSIS script
i tried the example in this link
http://nsis.sourceforge.net/How_to_turn_a_REBOL_script_into_EXE
and this the NSIS script i write to encap my rebol scrip according to my system knowing that:
1- the path to REBOL/VIEW interpreter

c:\program files\rebol\view\rebol.exe

2-the REBOL script (let it mdb.r) is found under the view directory

c:\program files\rebol\view\mdb.r

3-suppose that i put the NSIS script under the view directory
....now i want to generate mdb.exe

 

; NULLsoft Scriptable Install System
; make a REBOL Script executable
; provided by www.digicamsoft.com
 
; Name of the installer (don't really care here because of silent below)
Name "mdb"
 
; Don't want a window, just unpack files and execute
SilentInstall silent
 
; Set a name for the resulting executable
OutFile "mdb.exe"
 
 
; The installation directory
InstallDir "c:\program files\rebol\view"
 
; The stuff to install
Section ""
  ; Set output path to the installation directory.
  SetOutPath c:\
 
  ; put here requiered files
  File "rebol.exe" ; a REBOL interpreter
  File "mdb.r"   ; put one or more REBOL script(s)
 
  ; Execute and wait for the REBOL script to end
  ExecWait '"c:\program files\rebol\view\rebol.exe" "-s" "c:\program files\rebol\view\mdb.r"'
 
  ; Delete unpacked files from hard drive
  RMDir /r c:\
SectionEnd
  what's the error in?