gsn_csm_xy() timeseries plot....can not coerce?

Hi, I am trying to make a timeseries plot with gsn_csm_xy() but I keep
getting the error:

fatal:Argument type mismatch on argument (1) of gsn_csm_xy can not coerce

I am not sure why? I thought you could do it if your time variable was a
string.

Here is my code,

load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.ncl"
load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_csm.ncl"
load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/contributed.ncl"

begin

 site =
(/"cco","ccy","crn","drn","ffm","klm","lcd","lgt","log","mck","mhl", \
           "mta","ovl","pan","pld","ser","smt","std","svc"/)
 ns = dimsizes(site)

;do s=0,ns-1
 do s=0,0

 filename= "./"+site(s)+"/"+site(s)+".txt"
 lines = asciiread(filename,-1,"string")
 delim = ","
 yyjjj = tointeger(str_get_field(lines,1,delim))
 time = str_get_field(lines,2,delim)
 iwv = tofloat(str_get_field(lines,3,delim))

 jjj=mod(yyjjj,1000)
 jjj@calendar="julian"
 jjj@units="days since 2011-12-31"
 YYYYNNDD=tostring(cd_calendar(jjj,-2))

 NN=str_get_cols(YYYYNNDD,4,5)
 DD=str_get_cols(YYYYNNDD,6,7)
 HH=str_get_cols(time,0,1)
 MM=str_get_cols(time,3,4)

 date=NN+"/"+DD+" "+HH+":"+MM

 iwv@_FillValue = -9.99

  wks = gsn_open_wks("x11","cco_iwv")
  res = True

  printVarSummary(date)
  printVarSummary(iwv)

  plot = gsn_csm_xy(wks,date,iwv,res)

  delete([/lines,yyjjj,time,iwv,jjj/])

end do
end

-- 
Arthur J. Eiserloh, Jr.
San Jose State University
Graduate Student
Dept. of Meteorology and Climate Science

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Received on Mon Dec 9 10:54:54 2013