title: Arff File - Nominal Value not declared in header.
body: <p>I am generating an .arff file using a Java program. The file has about 600 attributes. </p>
  
  <p>I am unable to open the file in Weka Explorer. 
  It says: "nominal value not declared in header, read Token[0], line 626." </p>
  
  <p>Here is the first attribute line: @attribute vantuono numeric<br>
  Here are the first few chars of line 626: 0,0,0,0,1,0,0,0,0,1,0,1...</p>
  
  <p><strong>Why is WEKA unable to parse '0' as a numeric value?</strong> </p>
  
  <p>Interestingly, this happens only in this file. I have other files with numeric attributes accepting '0' for a value. </p>