http query: 'GET' /admin/server/vhost/users/ failing?

The web interface seems to work fine until i try to list users in a virtual host. Here's the error I get:

=CRASH REPORT==== 17-May-2006::11:55:46 ===
crasher:
pid: <0.894.0>
registered_name: []
error_info: {aborted,{no_exists,[offline_msg,{"admin","vhost"}]}}
initial_call: {ejabberd_http,receive_headers,
[{state,
gen_tcp,
#Port<0.1270>,
undefined,
undefined,
undefined,
undefined,
undefined,
undefined,
"en",
true,
true,
false,
[]}]}
ancestors: [ejabberd_http_sup,ejabberd_sup,<0.646.0>]
messages: []
links: [<0.802.0>,#Port<0.1270>]
dictionary: []
trap_exit: false
status: running
heap_size: 610
stack_size: 21
reductions: 1880
neighbours:

=SUPERVISOR REPORT==== 17-May-2006::11:55:46 ===
Supervisor: {local,ejabberd_http_sup}
Context: child_terminated
Reason: {aborted,{no_exists,[offline_msg,{"admin","vhost"}]}}
Offender: [{pid,<0.894.0>},
{name,undefined},
{mfa,{ejabberd_http,start_link,
[{gen_tcp,#Port<0.1270>},
[http_poll,web_admin]]}},
{restart_type,temporary},
{shutdown,brutal_kill},
{child_type,worker}]

(real virtual host name replaced with "vhost")

Any tips would be appreciated. thanks.