title: Could not resolve external workbook name 'excel_file_name.xlsx'. Workbook environment has not been set up
body: <p>My Spring Boot project using Apache Poi to read data from excel file.</p>
  <p>i use <code>FormulaEvaluator</code> to calculate the value of cell</p>
  <pre><code>FormulaEvaluator formulaEvaluator = workbook.getCreationHelper().createFormulaEvaluator();
  formulaEvaluator.evaluateFormulaCell(cell)
  </code></pre>
  <p>I get the error</p>
  <blockquote>
  <p>Could not resolve external workbook name
  'excel_file_name.xlsx'. Workbook
  environment has not been set up.</p>
  </blockquote>
  <p>How to resolve this issue ?</p>