Jquery validation plugin - TypeError validate is not a function

I am getting an error in my jQuery code. This is the error:

TypeError: jQuery.validator is undefined additional-methods.js:20 TypeError: $(...).validate is not a function index.php:115

This is my jQuery code:

<head>
<script type="text/javascript" src="js/jquery-1.10.2.js"></script>
<script type="text/javascript" src="js/jquery.form.js"></script>
<script src="http://jquery.bassistance.de/validate/additional-methods.js"></script>
</head>
<body>
            <form id="registerForm" method="post" action="logrej.php">
            <input name="login" type="text"/>
            <input name="nick" type="text"/>
            <input type="password" id="passw" name="password"/>
            <input type="password" name="retype" />
            <input type="submit" value="Zarejestruj!" />
            </form>
            <script>

                $("#registerForm").validate({
                    rules: {
                        login: {
                            required:true,
                            rangelenght: [4,20],
                            remote:"look.php"
                        },
                        nick : {
                            required:true,
                            rangelenght:[4,20],
                            remote:"look.php"
                        },
                        password: {
                            required:true,
                            rangelenght:[4.20]
                        },
                        retype: {
                            required:true,
                            equalTo:"#passw"
                        }
                    },
                    messages:{
                        login:{
                            required:"To pole jest wymagane!"
                        }
                    }
                })

            </script>

I think I have made some mistakes in the code. Can someone please solve this?