title: ARFF File Error
body: <p>I'm trying to create an arff-file, and I thought I had done a pretty good job until I tried to open the file with WEKA: "nominal value not declared in header, read token[0], line 18". Here's my file:</p>
  
  <pre><code>    @relation 'wettermessung'
      @attribute Stations_ID numeric
      @attribute Datum date 'dd.MM.yyyy'
      @attribute Qualitaet numeric
      @attribute Min_5cm numeric
      @attribute Min_2m numeric
      @attribute Mittel_2m numeric
      @attribute Max_2m numeric
      @attribute Relative_Feuchte numeric
      @attribute Mittel_Windstaerke numeric
      @attribute Max_Windgeschwindigkeit numeric
      @attribute Sonnenscheindauer numeric
      @attribute Mittel_Bedeckungsgrad numeric
      @attribute Niederschlagshoehe numeric
      @attribute Mittel_Luftdruck numeric
      @attribute kiteflying {yes, no}
      @data
      10004,15.01.2014,3,0,4,8,5,9,7,88,4,5,17,6,0,9,0,0,1004,3,no
      10004,16.01.2014,3,0,5,7,6,9,7,7,96,3,5,14,9,0,0,0,996,7,no
      10004,17.01.2014,3,0,6,8,7,5,8,88,4,5,15,2,1,0,0,996,6,no
      10004,18.01.2014,3,0,6,3,7,2,7,6,90,5,5,15,1,0,7,0,0,1000,6,no
      10004,19.01.2014,3,0,3,7,5,3,6,8,89,7,7,24,4,0,0,0,1001,8,yes
      ....
  </code></pre>
  
  <p>I just can't figure out what's gone wrong here!</p>
  
  <p>Please help :) </p>