title: Excel processing throws exception 'NoSuchMethodError' on Formula Evaluator for .xlsx file
body: <p>I have a problem while processing excel files.
  Processing of excel is working fine for .xls file.
  But it throws the following exception when it process .xlsx file on the Formula Evaluator. Is there a common method to get Formula Evaluator for .xls and xlsx or need to write seperate code? I am using poi-3.10.1</p>
  
  <p>Exception is right there at the following code:</p>
  
  <pre><code>FormulaEvaluator evaluator = workbook.getCreationHelper().createFormulaEvaluator();
  </code></pre>
  
  <p>It throws the below exception:</p>
  
  <pre><code>Caused by: java.lang.NoSuchMethodError: org.apache.poi.ss.formula.WorkbookEvaluator.&lt;init&gt;(Lorg/apache/poi/ss/formula/EvaluationWorkbook;Lorg/apache/poi/ss/formula/IStabilityClassifier;Lorg/apache/poi/hssf/record/formula/udf/UDFFinder;)V
      at org.apache.poi.xssf.usermodel.XSSFFormulaEvaluator.&lt;init&gt;(XSSFFormulaEvaluator.java:64)
      at org.apache.poi.xssf.usermodel.XSSFFormulaEvaluator.&lt;init&gt;(XSSFFormulaEvaluator.java:51)
      at org.apache.poi.xssf.usermodel.XSSFCreationHelper.createFormulaEvaluator(XSSFCreationHelper.java:51)
      at org.apache.poi.xssf.usermodel.XSSFCreationHelper.createFormulaEvaluator(XSSFCreationHelper.java:21)
  </code></pre>