I am having the following error in odoo 9 enterprise, I would be grateful for any help for this error:

Uncaught Error: cannot call methods on autocomplete prior to initialization; attempted to call method 'widget'

    at Function.error (http://localhost:8071/web/static/lib/jquery/jquery.js:247:23)

    at HTMLInputElement.<anonymous> (http://localhost:8071/web/static/lib/jquery.ui/jquery-ui.js:507:15)

    at Function.each (http://localhost:8071/web/static/lib/jquery/jquery.js:383:58)

    at jQuery.fn.init.each (http://localhost:8071/web/static/lib/jquery/jquery.js:136:31)

    at jQuery.fn.init.$.fn.(anonymous function) [as autocomplete] (http://localhost:8071/web/static/lib/jquery.ui/jquery-ui.js:499:9)

    at Class.<anonymous> (http://localhost:8071/web/static/src/js/views/form_relational_widgets.js:87:79)

    at Class.trigger (http://localhost:8071/web/static/src/js/framework/mixins.js:222:31)

    at Class.trigger (http://localhost:8071/web/static/src/js/framework/mixins.js:272:42)

    at HTMLHtmlElement.<anonymous> (http://localhost:8071/web/static/src/js/framework/core.js:31:18)

    at HTMLHtmlElement.dispatch (http://localhost:8071/web/static/lib/jquery/jquery.js:4641:58)

Thanks for all.