[Oscailt] Error Processing Object Management Request

[Sigmund Baginov]

Hello, I'm trying to remove the vertical menu in this page
http://piemonte.indymedia.org/breaking_news
The vertical menu called Anarkismo Newswire. When I try to edit the 
object it says

    * Error Processing Object Management Request
    * Failed to Load Specified Object
    * Object 2419 does not exist in this object set

What have I to do to remove the column?
I think it is a bug somewhere. I tried to rebuild all the cache too but 
it doesn't works

Thanks
SiBa