when I do this:
graph.put_wall_post("test",{name: "test_post",link: LINK_URL})
I have an error:
*** Koala::Facebook::ServerError Exception: type: OAuthException, code: 2, message: An unexpected error has occurred. Please retry your request later. [HTTP 500]
Solved!!
The problem is URL from LINK_URL variable blocked by facebook. I think too many tests to use that URL during the development.
when i try use another URL its work!