ruby - acts_as_messagable doesn't work on rails 4.1 -

i using 'acts_as_messagable' gem private messaging between users.

my model:

class user < activerecord::base    acts_as_messageable :table_name => "messages" ..  end

i have error on start application:

`method_missing': protected method `default_scope' called #<class:0x007f84d7870da8> (nomethoderror)

current rails version 4.1, migrations done.

what root of problem?

it's not compatible docs:

the gem compatible rails 2.3, upgrade rails 3 planned

My