error with addfiles and ListSetType

Hi I keep getting an error at ncl 19> in the <snip> of code below.
What would cause this error?
Thank you in advance.
-Erik

DA:/discover/nobackup/eunoble/myWorkDir/OUTPUT/PROJ/27km_NCEP2/OUTPUT/Experiment_27km_01>
ncl
 Copyright (C) 1995-2009 - All Rights Reserved
 University Corporation for Atmospheric Research
 NCAR Command Language Version 5.1.1
 The use of this software is governed by a License Agreement.
 See http://www.ncl.ucar.edu/ for more details.
ncl 0> load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.ncl"
ncl 1> load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_csm.ncl"
ncl 2> load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/contributed.ncl"
ncl 3> load "$NCARG_ROOT/lib/ncarg/nclscripts/wrf/WRF_contributed.ncl"
ncl 4> load "$NCARG_ROOT/lib/ncarg/nclscripts/wrf/WRFUserARW.ncl"
ncl 5>
ncl 6> ;***************************************************************
ncl 7> ; Change these parts
ncl 8> ;***************************************************************
ncl 9> Files = "*_wind_diagnostics.nc" ;input files
ncl 10> diro = "./" ;output directory
ncl 11> NCFILE1 = "UV" ;output file
ncl 12> ;***************************************************************
ncl 13> ; Read in WRF Files
ncl 14> ;***************************************************************
ncl 15> files = systemfunc (" ls " + Files) ; file paths
ncl 16> numFILES = dimsizes(files)
ncl 17>
ncl 18> ;========================
ncl 19> ListSetType (files, "join") ; concatenate or
"merge" (default)
fatal:Number of elements of dimension (0) of argument (0) is (97) in
function (ListSetType), expected (1) elements
fatal:Execute: Error occurred at or near line 19

ncl 20> print(files)
Variable: files
Type: string
Total Size: 776 bytes
            97 values
Number of Dimensions: 1
Dimensions and sizes: [97]
Coordinates:
(0) wrfout_d01_2006-09-02_00:00:00_wind_diagnostics.nc

<snip>

(80) wrfout_d01_2006-09-12_00:00:00_wind_diagnostics.nc
(81) wrfout_d01_2006-09-12_03:00:00_wind_diagnostics.nc
(82) wrfout_d01_2006-09-12_06:00:00_wind_diagnostics.nc
(83) wrfout_d01_2006-09-12_09:00:00_wind_diagnostics.nc
(84) wrfout_d01_2006-09-12_12:00:00_wind_diagnostics.nc
(85) wrfout_d01_2006-09-12_15:00:00_wind_diagnostics.nc
(86) wrfout_d01_2006-09-12_18:00:00_wind_diagnostics.nc
(87) wrfout_d01_2006-09-12_21:00:00_wind_diagnostics.nc
(88) wrfout_d01_2006-09-13_00:00:00_wind_diagnostics.nc
(89) wrfout_d01_2006-09-13_03:00:00_wind_diagnostics.nc
(90) wrfout_d01_2006-09-13_06:00:00_wind_diagnostics.nc
(91) wrfout_d01_2006-09-13_09:00:00_wind_diagnostics.nc
(92) wrfout_d01_2006-09-13_12:00:00_wind_diagnostics.nc
(93) wrfout_d01_2006-09-13_15:00:00_wind_diagnostics.nc
(94) wrfout_d01_2006-09-13_18:00:00_wind_diagnostics.nc
(95) wrfout_d01_2006-09-13_21:00:00_wind_diagnostics.nc
(96) wrfout_d01_2006-09-14_00:00:00_wind_diagnostics.nc
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Received on Wed Jan 26 17:57:51 2011