[Asterisk-Users] Log Error

[Anton Krall]

Guys, this error has been driving me nuts and I see no indication anywhere
as to what it may mean.
Anybody has any clues on this?
 
    -- User ended message by pressing #
    -- Playing 'auth-thankyou' (language 'en')
    -- Playing 'vm-review' (language 'en')
    -- Saving message as is
    -- Playing 'vm-msgsaved' (language 'en')
Mar  4 21:02:06 WARNING[8816]: app_queue.c:374 changethread: Can't change
device '**Unknown**' with no technology!

Any help will be appreciated.