I have a problem with ipkg. When trying to run ipkg update i get the following error

Code:
[admin@xxxxx /opt]$ ipkg update
Downloading http://ipkg.nslu2-linux.org/feeds/optware/oleg/cross/stable/Packages.gz
BusyBox v1.1.3 (2006.06.29-17:07+0000) multi-call binary

Usage: wget [-c|--continue] [-q|--quiet] [-O|--output-document file]
                [--header 'header: value'] [-Y|--proxy on/off] [-P DIR] url

An error ocurred, return value: 1.
Collected errors:
ipkg_download: ERROR: Command failed with return value 1: `wget    -q -P  http://ipkg.nslu2-linux.org/feeds/optware/oleg/cross/stable/Packages.gz'
WARNING: Unable to remove temporary directory: : No such file or directory
What could be the problem?