Make sure the file format is preserved EXACTLY. The header in the CSV file is important. For example, your file should look like:
Campus User Tracking
End Hosts Immediate Report as of 12 Dec 2008, 12:03:23 EST
Last User Tracking Started at : 12 Dec 2008, 10:00:00 EST. Ended at : 12 Dec 2008, 10:01:40 EST. Completed in 1 minutes 40 seconds.
User Name,MAC Address,Host Name,IP Address,Subnet,Device Name,Port,VLAN,Last Seen,Notes
"",00-80-9f-77-18-bd,alcatel-iptouch-00809f7718bxx.msnet.railb.be,10.85.13.54,10.85.13.0/24,hsrinsa34, Fa0/13 ,IpTel_RingstationA_0,2008/12/12 10:06:08,"telfs91191640.msnet.railb.be"