Exension Export/Import Tool for open cart 1.5.1error

I have a new install of opencart 1.5.1 and I just installed opencart-1-5-1-x-2-export-import I did follow the process as it was indicated in the readme.txt , I even wen over it a few times and made sure all the added code are in the correct place. put every time I click on export I get the following error message.

Fatal error: require_once() [function.require]: Failed opening required 'Spreadsheet/Excel/Writer.php' (include_path='.:/usr/local/php5/lib/php') in /home/content/g/o/l/gold2897/html/vitamin/str/admin/model/tool/export.php on line 2302
my hosting is the hated godaddy but I have too many site with them to change hosting so please help me out.

Thank you