Problems generating spreadsheet

Hello,

I am writing a spreadsheet read/write library in Object Pascal and I
am working on a backend to support OpenDocument:
http://wiki.lazarus.freepascal.org/FPSpreadsheet

I am having some problems. OpenOffice says that the file generated by
my library is corrupted, but it seams identifical to files generated
by OpenOffice to me! Could someone help me? I attached the file.

Also, is there a software which will show a meaningfull error message
explaining what is wrong in the file?

thanks,
-- 
Felipe Monteiro de Carvalho