jQuery Mobile + UI: Uncaught TypeError (1.2.0 final relesed)

jQuery Mobile + UI: Uncaught TypeError (1.2.0 final relesed)

I have just updated jquery mobile js to 1.2.0 final version But it gives me error on one page. Below is the error
  2. Uncaught TypeError: Object function (name, prototype) {
  3.     var namespace = name.split(".")[0];
  4.     name = name.split(".")[1];

  6.     // create plugin method
  7.     $.fn[name] = function(options) {
  8.         var isMethodCall = (typeof options == 'string'),
  9.             args = Array.prototype.slice.call(arguments, 1);

  11.         // prevent calls to internal methods
  12.         if (isMethodCall && options.substring(0, 1) == '_') {
  13.             return this;
  14.         }

  16.         // handle getter methods
  17.         if (isMethodCall && getter(namespace, name, options, args)) {
  18.             var instance = $.data(this[0], name);
  19.             return (instance ? instance[options].apply(instance, args)
  20.                 : undefined);
  21.         }

  23.         // handle initialization and non-getter methods
  24.         return this.each(function() {
  25.             var instance = $.data(this, name);

  27.             // constructor
  28.             (!instance && !isMethodCall &&
  29.                 $.data(this, name, new $[namespace][name](this, options))._init());

  31.             // method call
  32.             (instance && isMethodCall && $.isFunction(instance[options]) &&
  33.                 instance[options].apply(instance, args));
  34.         });
  35.     };

  37.     // create widget constructor
  38.     $[namespace] = $[namespace] || {};
  39.     $[namespace][name] = function(element, options) {
  40.         var self = this;

  42.         this.namespace = namespace;
  43.         this.widgetName = name;
  44.         this.widgetEventPrefix = $[namespace][name].eventPrefix || name;
  45.         this.widgetBaseClass = namespace + '-' + name;

  47.         this.options = $.extend({},
  48.             $.widget.defaults,
  49.             $[namespace][name].defaults,
  50.             $.metadata && $.metadata.get(element)[name],
  51.             options);
  52.         this.element = $(element)
  53.             .bind('setData.' + name, function(event, key, value) {
  54.                 if (event.target == element) {
  55.                     return self._setData(key, value);
  56.                 }
  57.             })
  58.             .bind('getData.' + name, function(event, key) {
  59.                 if (event.target == element) {
  60.                     return self._getData(key);
  61.                 }
  62.             })
  63.             .bind('remove', function() {
  64.                 return self.destroy();
  65.             });
  66.     };
  67.     // add widget prototype
  68.     $[namespace][name].prototype = $.extend({}, $.widget.prototype, prototype);

  70.     // TODO: merge getter and getterSetter properties from widget prototype
  71.     // and plugin prototype
  72.     $[namespace][name].getterSetter = 'option';
  73. } has no method 'extend'
I have also tried to solved this problem after read on jquery mobile blog but i am not succeeded. I have also tried jQuery.noConflict() but it not works.

I know that the problem is because I have used jquery ui core js on the page where I got the error. I have tried to put that js before the jquery mobile js, the error is gone but page displays nothing. I have used jquery ui core js for progress bar.

somebody there who has solution of this problem?