Ошибка hide()…fadeIn() is not a function

Это старый код, но почему именно такая ошибка мне не понятно. Может кто то сталкивался с таким?

$(document).ready(function(){
var msg_template = '<p><span class="msg-block"><strong></strong><span class="time"></span><span class="msg"></span></span></p>';
$('.chat-message button').click(function(){
    var input = $(this).siblings('span').children('input[type=text]');      
    if(input.val() != ''){
        add_message('You','img/demo/av1.jpg',input.val(),true);
    }       
});
$('.chat-message input').keypress(function(e){
    if(e.which == 13) { 
        if($(this).val() != ''){
            add_message('You','img/demo/av1.jpg',$(this).val(),true);
        }       
    }
});
setTimeout(function(){
        add_message('Linda','img/demo/av2.jpg','Hello Every one do u want to freindship with me?')
    },'1000');
setTimeout(function(){
        add_message('Mark','img/demo/av3.jpg','Yuppi! why not sirji!!.')
    },'4000');
setTimeout(function(){
        add_message('Linda','img/demo/av2.jpg','Thanks!!! See you soon than')
    },'8000');
setTimeout(function(){
        add_message('Mark','img/demo/av3.jpg','ok Bye than!!!.')
    },'12000'); 
setTimeout(function(){
        remove_user('Linda','Linda')
    },'16000');
var i = 0;
function add_message(name,img,msg,clear) {
    i = i + 1;
    var  inner = $('#chat-messages-inner');
    var time = new Date();
    var hours = time.getHours();
    var minutes = time.getMinutes();
    if(hours < 10) hours = '0' + hours;
    if(minutes < 10) minutes = '0' + minutes;
    var id = 'msg-'+i;
    var idname = name.replace(' ','-').toLowerCase();
    inner.append('<p id="'+id+'" class="user-'+idname+'">'
                                    +'<span class="msg-block"><img src="'+img+'" alt="" /><strong>'+name+'</strong> <span class="time">- '+hours+':'+minutes+'</span>'
                                    +'<span class="msg">'+msg+'</span></span></p>');
    $('#'+id).hide().fadeIn(800);
    if(clear) {
        $('.chat-message input').val('').focus();
    }
    $('#chat-messages').animate({ scrollTop: inner.height() },1000);
}
function remove_user(userid,name) {
    i = i + 1;
    $('.contact-list li#user-'+userid).addClass('offline').delay(1000).slideUp(800,function(){
        $(this).remove();
    });
    var  inner = $('#chat-messages-inner');
    var id = 'msg-'+i;
    inner.append('<p class="offline" id="'+id+'"><span>User '+name+' left the chat</span></p>');
    $('#'+id).hide().fadeIn(800);
}

});