[jQuery] Error thrown - object is undefined

[jQuery] Error thrown - object is undefined


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);
}
});