Dialog not working with jui 1.6rc5 and jq 1.3: $[namespace][name] is not a constructor

Dialog not working with jui 1.6rc5 and jq 1.3: $[namespace][name] is not a constructor


With this HTML markup:
<div title="Dialogo hola" id="dialogo">Hola
</div>
And this js code (it doesn't matter where do I place it, it throws the
same error):
$('#dialogo').dialog();
I get:
$[namespace][name] is not a constructor
jquery-ui-personalized-1.6rc5.js
Line 272
Line 272 is:
$.data(this, name, new $[namespace][name](this, options)));
Any help is appreciated.