[jQuery] Error thrown - object is undefined

[jerome]

FireBug is reporting this error. Any insight would be appreciated.
jquery.js (line 3633)
object is undefined
[Break on this error] var name, i = 0, length = object.length;\n

I am using jQuery 1.3.2

var that=this;
jQuery.ajax({
        type : "POST",
        dataType : "json",
        url : "js/tsbtw-object.js",
        success : function(data, statusText){

                var verbArray = data.verbs;
                var adjArray = data.adjectives;
                var subjArray = data.subjects;

                for(var i = 0; i<verbArray.length; i++){

                        var verbTime = Math.floor(Math.random()*1000);

                        jQuery("#verb-content").fadeOut(verbTime, function(){
                                
jQuery(that).text(verbArray[i]).fadeIn(verbTime);
                        });
                }
                for(var j = 0; j<adjArray.length; j++){

                        var adjTime = Math.floor(Math.random()*2000);

                        jQuery("#adj-content").fadeOut(adjTime, function(){
                                jQuery(that).text(adjArray[j]).fadeIn(adjTime);
                        });
                }
                for(var k = 0; k<subjArray.length; k++){

                        var subjTime = Math.floor(Math.random()*3000);

                        jQuery("#subj-content").fadeOut(subjTime, function(){
                                
jQuery(that).text(subjArray[k]).fadeIn(subjTime);
                        });
                }
        },
        error: function (xhr, ajaxOptions, thrownError){
                alert(xhr.statusText);
                alert(thrownError);
    }
});