Fatal Error !

Hi,

When try to access the widget area, I seen no any widget but the below error text

Fatal error: Call to undefined function wp_list_widgets() in /home/tuey/domains/dgtalvalley.com/public_html/wp-admin/widgets.php on line 340

I'm not sure what is wrong again ?

Please kindly help.

Thank you.

Seems like a problem with WP - perhaps while updating something went wrong.
Is it fresh site or you already have there own data?

Hi , It's an old site which I previous install other theme but already create the new sql DB and install to the new DB .

Thank you.

With old site using quickstart is not a wise method. Quickstart is for clean - new sites, it puts demo data into clean database and sets all settings ootb. For existing sites you should use standard template package.