ggraph chloropleth: I/O exception occurred

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ggraph chloropleth: I/O exception occurred

Albert-Jan Roskam
Hi,
 
I am trying to create a chloropleth of the number of persons (data) [aant_inw] by municipality_code (key) [gem_code]. I converted a .shp + .dbf to an .smz,
then I genererated the code below. However, I keep getting the error "An I/O exception occurred" (in red font).
What am I doing wrong? It is the first time that I am using this feature, so it might be something simple.
 
VARIABLE LEVEL aant_inw (ordinal).  /* otherwise the graphboard template chooser won't let me select a chloropleth of values.
GGRAPH
  /GRAPHDATASET NAME="graphdataset"
    VARIABLES=aant_inw[LEVEL=ordinal] gm_code[LEVEL=nominal]
    MISSING=LISTWISE REPORTMISSING=NO
  /GRAPHSPEC SOURCE=VIZTEMPLATE(NAME="Choropleth of Values"[LOCATION=LOCAL]
    MAPPING( "color"="aant_inw"[DATASET="graphdataset"]
    "Data_Key"="gm_code"[DATASET="graphdataset"]))
    VIZSTYLESHEET="Traditional"[LOCATION=LOCAL]
    LABEL='CHOROPLETH OF VALUES: gm_code-aant_inw'
    DEFAULTTEMPLATE=NO
    VIZMAP="gem_2011_gn1"[LOCATION=LOCAL TYPE=DATA mapkey="GM_CODE" SHOWALLFEATURES=YES].
 
Thank you in advance!
 
Regards,
Albert-Jan


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