jQueryUI DatePicker error: Typeerror:inst is undefined

Premise: To reference the JS and so on all reference good

Call the date control's input:

<input id= "StartTime" name= "StartTime" class= "Hasdatepicker" value= ""/>

JS called:

$ ("#starttime"). DatePicker (' show ');

In the page has been reported typeerror:inst is undefined error, the reason for most of the online is because the ID is not unique, but this ID is unique, but the comparison with the success of the page does not see any difference, do the demo is an error, In the Firebug debugging also a see what reason, later found is transduction sister to the class has a problem ah, class= "Hasdatepicker" removed on OK, class name incredibly and jQueryUI The class name in the JS call conflicts, but also a small probability event.

jQueryUI DatePicker error: Typeerror:inst is undefined