title: during opening an excel file with java i have this error: Warning: Usage of a local non-builtin name
body: <p>when i try to open an excel file i have this error message.
  Warning:  Usage of a local non-builtin name</p>
  
  <p>My excel file file contains more than 1600 rows
  if i try the same code and open a small excel file, it's working.</p>
  
  <p>Why please?</p>
  
  <p>I use JXL
  thank you</p>