mod_roster_odbc not starting‏

Hi,

After enabling mod_roster_odbc module, when I try to restart my server I see the below in my log.

2015-02-26 14:07:03.725 [critical] <0.836.0>@gen_mod:start_module:94 Problem starting the module mod_roster_odbc for host <<"localhost">>
options: []
error: undef
[{mod_roster_odbc,start,[<<"localhost">>,[]],[]},
{gen_mod,start_module,3,[{file,"src/gen_mod.erl"},{line,83}]},
{lists,foreach,2,[{file,"lists.erl"},{line,1336}]},
{ejabberd_app,start,2,[{file,"src/ejabberd_app.erl"},{line,69}]},
{application_master,start_it_old,4,
[{file,"application_master.erl"},{line,272}]}]
2015-02-26 14:07:03.726 [critical] <0.836.0>@gen_mod:start_module:99 ejabberd initialization was aborted because a module start failed.
The trace is [{mod_roster_odbc,start,[<<"localhost">>,[]],[]},{gen_mod,start_module,3,[{file,"src/gen_mod.erl"},{line,83}]},{lists,foreach,2,[{file,"lists.erl"},{line,1336}]},{ejabberd_app,start,2,[{file,"src/ejabberd_app.erl"},{line,69}]},{application_master,start_it_old,4,[{file,"application_master.erl"},{line,272}]}].
(END)

Then I updated my configuration for both mod_offline and mod_roster as follows

{mod_roster, [{db_type,odbc}]},

{mod_offline, [
{access_max_user_messages, max_user_offline_messages},
{db_type,odbc}
]},

I didnt get any error. Server is running. But my database tables are still blank(except user table). So seems like its not storing the offline data to my external database. How to fix it please help...

Thanks