validators crash when validate()

[nitroamos]

I'm using v9.0p_2014-01-24 pro, Safari 6.1.1. The example unexpectedly generates a console error.

var vm = isc.ValuesManager.create({});
isc.DynamicForm.create({
   valuesManager: vm,
   fields: [
      {
         type:"text",
         title:"Entry",
         defaultValue: "asdf",
         validators: [
            {type:"contains",substring:"/"}
         ]
      }
   ]
});

isc.Button.create({
   top:50,
   title:"Validate",
   click: function(){
      console.log("valid:",vm.validate());
   }
});

The default value is invalid (because it doesn't have a "/"), so I'd expect to see the form display an error when the button is clicked. Instead, the console gets the error:

[Error] TypeError: 'undefined' is not an object (evaluating '_2.contains')
	isc_Canvas_addValidationError (ISC_Core.js, line 2740)
	isc_Canvas_addValidationError (ISC_Core.js, line 2738)
	isc_DynamicForm_validate (ISC_Forms.js, line 430)
	isc_ValuesManager_validate (ISC_Forms.js, line 2073)
	click (test.js, line 21)
	isc_StatefulCanvas_handleActivate (ISC_Foundation.js, line 226)
	isc_StatefulCanvas_handleClick (ISC_Foundation.js, line 227)
	isc_c_EventHandler_bubbleEvent (ISC_Core.js, line 1269)
	isc_c_EventHandler_handleClick (ISC_Core.js, line 1145)
	isc_c_EventHandler__handleMouseUp (ISC_Core.js, line 1136)
	isc_c_EventHandler_handleMouseUp (ISC_Core.js, line 1128)
	isc_c_EventHandler_dispatch (ISC_Core.js, line 1302)
	anonymous

[nitroamos]

The problem was resolved when I defined a "name" for the TextItem.