How to remove fireEvent?

I have a fireEvent listener. I want to remove this listener, but my listener is nickname function. I add

Ti.App.removeEventListener('drawBaseMapHandler');

It will show

[WARN] Exception in event callback. {
    line = 36;
    message = "*** -[NSMutableArray objectAtIndex:]: index 1 beyond bounds [0 .. 0]";
    sourceId = 141614720;
}

how to remove fireevent.

my code is

myWebView.addEventListener('load',function(e){ myWebView.evalJS("Ti.App.addEventListener('drawBaseMapHandler',function(e){" +"var gObj=gChart(e.strUrl);"+"drawBaseMap(gObj);"+"})");
            Ti.App.removeEventListener('drawBaseMapHandler');
});

Here you go: http://developer.appcelerator.com/question/127638/why-does-removeeventlistener-need-a-callback

Hi Chang,

Ivan in the link explained it in a fairly superb manner. I think instead of evaluating the JS code through webview you should add that code directly like this:

myWebView.addEventListener('load',function(e){ 
    var eventId = Ti.App.addEventListener('drawBaseMapHandler',function(g){ 
                              var gObj=gChart(g.strUrl);
                              drawBaseMap(gObj);
                   });
 
     Ti.App.removeEventListener('drawBaseMapHandler', eventId);
});

Please do let me know as to why you want your listener to be added using myWebView.evalJS() function