PAR Problem

Hello My friends,

I am from Pakistan & have been benifeting from your website for a while 
now. However, I have stuck a stone wall now and can't get throw. My 
problem is that I am trying to utilize the Spreadsheet::WriteExcel 
module from John McNamara and everything seems to be working great. When 
I run my program as perl csv2xls.pl book1.csv book.xls, it works fine. 
Although, what I am trying to do, is to trap some error checking into 
the perl program. Although book1.csv does not exist, it should give me 
an error saying "Couldn't open the .csv file named book1.csv: No such 
file or directory". It gives me that error when I run it as "perl 
csv2xls.pl book1.csv book.xls" but when I create the .exe file using 
PAR, it gives me the following error message :-
Couldn't open the .csv file named book10.csv: No such file or directory

      (in cleanup) Can't use an undefined value as a HASH reference at 
C:/Perl
/site/lib/Spreadsheet/WriteExcel/Workbook.pm line 699.

Can you help me with the later error message. I am not sure where to 
look for the error message. I tried reading the workbook.pm file but it 
looks fine.

Thanks,
Rehman.