hello, When m using dialog in jquery , it throws error....error is as below "Index:23 Uncaught TypeError: $(...).dialog is not a function"...so,plz anyone can help me to solve error

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jQuery

<script>
$(document).ready(function () {
$("#StateTextId").click(function () {
$("#SelectCity").dialog("open");

});
});


$("#SelectCity").dialog({
autoOpen: false
});

</script>