Channel request /com/nokia/MissionControl/requests/r17 failed, error: Did not receive a reply.

Binary package hint: telepathy-mission-control-5

Connecting to my GTalk account, the contact list is displayed, with all my contacts, but I can't start a conversation with any of them.

In the debug window, I see this for mission-control, everytime I attempt to start a conversation :
Channel request /com/nokia/MissionControl/requests/r17 failed, error: Did not receive a reply. Possible causes include: the remote application did not send a reply, the message bus security policy blocked the reply, the reply timeout expired, or the network connection was broken.

Gabble doesn't show any debug information (in the debug window).

Empathy shows :
contact_list_view_row_activated: Starting a chat
dispatcher_channel_request_failed_cb: Request failed: /com/nokia/MissionControl/requests/r19 - Did not receive a reply [...]

Ubuntu Lucid updated.

telepathy-mission-control-5 5.3.2-2
telepathy-gabble 0.8.11-1
empathy 2.29.91.2-0ubuntu1