title: Invalid property value encountered in column-number fop
body: <p>I am using Apache FOP for printing my file to PDF. While conversion from FO to PDF I am getting the below error:</p>
  
  <blockquote>
    <p>Invalid property value encountered in column-number="5": org.apache.fop.fo.expr.PropertyException: fo:table-cell overlaps in column 5. (See position 17071:79)</p>
  </blockquote>
  
  <p>I am getting this for many rows and columns.</p>
  
  <p>In the pdf the tables are coming properly. Can anyone tell me what is the root cause for this error? When is this error generally thrown?</p>