[Koha] Z39.50 error important

hi all i'm using koha 2.2.8 and whem i'm tried using z39.50 gives me server error . could any one help me to solving this problem .many thanx _________________________________________________________________ Invite your mail contacts to join your friends list with Windows Live Spaces. It's easy! http://spaces.live.com/spacesapi.aspx?wx_action=create&wx_url=/friends.aspx&mkt=en-us