Can't display Calendar with XML setup on Grid and TreeGrid

I’m trying to edit a calendar column setting up the Grid with XML header, when loading I get the following

error message in calendar/events.js



Error: invalid label



The line is:



if(!YAHOO.util.Event)

{

YAHOO.util.Event=function()

{

var loadComplete=false;

var listeners=[];

var delayedListeners=[];

var unloadListeners=[];

var customEvents=[];

var legacyEvents=[];

var legacyHandlers=[];

return

{



LINE WITH THE ERROR MESSAGE ************** LINE 4

EL:0,TYPE:1,FN:2,WFN:3,SCOPE:3,ADJ_SCOPE:4,isSafari:(navigator.userAgent.match(/safari/gi)),isIE:(!this.isSafari&&navigator.userAgent.match(/msie/gi)),addListener:function(el,sType,fn,oScope,bOverride)



************



Please Advice



Thanks



Alberto