R help - Sep 2004 - Rggobi function error

Hello,
I was working  with Rggobi and was trying to use the function 
setIdentifyHandler.ggobi(f).
The error I am getting is
 Error in setIdentifyHandler.ggobi(f) : attempt to apply non-function

The function setIdentifyHandler.ggobi is

function (f, .gobi = getDefaultGGobi())
{
    gobj = unclass(.gobi)$ref
    gobj$AddCallback("identify-point", function(gg, sp, which,
        d) f(which, d))
}

AddCallback function is not recognised as a function and so the error - 
non-function.

Did I install Rggobi properly, or do I need any other add-on packages to 
implement the handlers?

I am using R-1.9.1 and Rggobi-1.0-0 in unix .

Thank you
Aruna