Error in Customize your site

I just installed Sydney theme. When I clic on customize your site I got this error, don´t know how to solve it: Fatal error: Call to undefined method WP_Customize_Manager::add_panel() in /hsphere/local/home/ailian/panoramicas360.co/wordpress/wp-content/themes//inc/customizer.php on line 101

Hi,

By any chance, are you using a version of WordPress older than 4.0? Note that WP is at 4.5 at the moment.

Thanks Blade you were right. I updated WP and everything is OK now. Best regards and nice weekend

Vlad sorry my corrector misspelled your name

i used the newest wordpress…but still get notification " Fatal error: Call to undefined method WP_Customize_Manager::add_panel() in /home/dishubntbprov/public_html/wp-content/themes/sydney/inc/customizer.php on line 104" while customize

I use wrdpress v. 4.7.3