VPN doesn't work: nothing happens, and no error message

I added a new VPN connection, using openconnect. When I click it under "Connections" in the popup, nothing happens.

I saw this line in /var/log/syslog, but I don't think that's a good way to present it to the user:

Feb 27 19:53:56 dima-thinkpad NetworkManager[949]: <warn> connection /org/freedesktop/NetworkManager/Settings/2 failed to activate: (2) The VPN service 'org.freedesktop.NetworkManager.openconnect' was not installed.

ProblemType: Bug
DistroRelease: Ubuntu 12.10
Package: network-manager-kde (not installed)
ProcVersionSignature: Ubuntu 3.5.0-25.38-generic 3.5.7.4
Uname: Linux 3.5.0-25-generic x86_64
ApportVersion: 2.6.1-0ubuntu10
Architecture: amd64
Date: Wed Feb 27 19:55:34 2013
EcryptfsInUse: Yes
InstallationDate: Installed on 2013-02-23 (5 days ago)
InstallationMedia: Kubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.1)
MarkForUpload: True
SourcePackage: networkmanagement
UpgradeStatus: No upgrade log present (probably fresh install)