Nagios monitoring netware server

Hi, I’m using nagios 2.0b3 to monitor my netware server with the check_nwstat and mrtgext. nlm plugins. When I ran check_nwstat with the variable VPF to monitor netware server free disk space it is reporting wrong percentage for the disk space. For example is will show 5000MB free with (254433%). Any ideas will be helpful. :evil: