FATAL ERROR ILDY THEME

Good morning
I went to the administrator panel of my website;
I wanted to customize a few things and clicking to APPEARANCE->CUSTOMIZE , this message appears:
“Fatal error: Class ‘WP_Customize_Background_Position_Control’ not found in /home/gianos/domains/gianos.it/public_html/wp-content/themes/illdy/inc/customizer/panels/jumbotron.php on line 199”.
Why? how do I fix it?
Thank you in advance

Hello there,

I hope you are doing well today.

Please ensure that you install any pending updates available by going to Dashboard > Updates and install any updates that you may have pending because your theme or WordPress may need to be updated.

Best Regards,
Support