Import/Export PHPExecl error on import

Running at Hostgator shared Apache. Installed Import/Export on OpenCart 1.4.9. Export works fine, but import generates this error:

Fatal error: require_once() [function.require]: Failed opening required 'Classes/PHPExcel.php' (include_path='.:/usr/lib/php:/usr/local/lib/php') in /home/mcgreal/public_html/admin/model/tool/export.php on line 1166

I didn't make any changes to the exported file, nor did I open it before trying to import it back.

McGreal
http://www.fanaticsite.com