Workbook reader object is null

[Birendar Waldiya]

Hi Forum, 
 
I am generating an excel through perl script which i try to uplaod  using
POI api  , I am gettign following  error ."java.lang.IllegalStateException:
The Workbook reader object is null."
 
 
[5/12/06 1:30:15:233 EDT] 51585eb4 SystemOut     O Fri May 12 01:30:15 EDT
2006:Servlet.Engine.Transports : 3:I:Exception in FileUpload : 
[5/12/06 1:30:15:234 EDT] 51585eb4 SystemOut     O Fri May 12 01:30:15 EDT
2006:Servlet.Engine.Transports : 3:S:Error in The Workbook reader object is
null.
[5/12/06 1:30:15:234 EDT] 51585eb4 SystemOut     O Fri May 12 01:30:15 EDT
2006:Servlet.Engine.Transports : 3:E:
[5/12/06 1:30:15:234 EDT] 51585eb4 SystemOut     O Fri May 12 01:30:15 EDT
2006:Servlet.Engine.Transports : 3:E:Exception:
java.lang.IllegalStateException: The Workbook reader object is null.
[5/12/06 1:30:18:830 EDT] 43061eb5 SystemOut     O Fri May 12 01:30:18 EDT
2006:Servlet.Engine.Transports : 0:I:============= FORM DATA ==============
 
 
any pointers please 
 
Thanks
Regrads 
Birendar S Waldiya