Customizer fatal error

After my websites host (hostinger) made an error migrating my sites, they recovered the deleted wordpress files from an old backup. this resulted in fatal error when I access appearance customizer on the wp admin. also there is an error thats visible on the home screen slider.

Please help as I have been waiting for the host tech team to fix the error to no avail.

the error I get when I access Appearance customizer below

Fatal error: Uncaught Error: Attempt to assign property “priority” on null in /home/u645215727/domains/feelinghealingtherapy.com/public_html/wp-content/themes/paris/megatheme/customizer/customizer.php:408 Stack trace: #0 /home/u645215727/domains/feelinghealingtherapy.com/public_html/wp-includes/class-wp-hook.php(308): my_customize_register() #1 /home/u645215727/domains/feelinghealingtherapy.com/public_html/wp-includes/class-wp-hook.php(332): WP_Hook->apply_filters() #2 /home/u645215727/domains/feelinghealingtherapy.com/public_html/wp-includes/plugin.php(517): WP_Hook->do_action() #3 /home/u645215727/domains/feelinghealingtherapy.com/public_html/wp-includes/class-wp-customize-manager.php(934): do_action() #4 /home/u645215727/domains/feelinghealingtherapy.com/public_html/wp-includes/class-wp-hook.php(308): WP_Customize_Manager->wp_loaded() #5 /home/u645215727/domains/feelinghealingtherapy.com/public_html/wp-includes/class-wp-hook.php(332): WP_Hook->apply_filters() #6 /home/u645215727/domains/feelinghealingtherapy.com/public_html/wp-includes/plugin.php(517): WP_Hook->do_action() #7 /home/u645215727/domains/feelinghealingtherapy.com/public_html/wp-settings.php(639): do_action() #8 /home/u645215727/domains/feelinghealingtherapy.com/public_html/wp-config.php(93): require_once(‘/home/u64521572…’) #9 /home/u645215727/domains/feelinghealingtherapy.com/public_html/wp-load.php(50): require_once(‘/home/u64521572…’) #10 /home/u645215727/domains/feelinghealingtherapy.com/public_html/wp-admin/admin.php(34): require_once(‘/home/u64521572…’) #11 /home/u645215727/domains/feelinghealingtherapy.com/public_html/wp-admin/customize.php(13): require_once(‘/home/u64521572…’) #12 {main} thrown in /home/u645215727/domains/feelinghealingtherapy.com/public_html/wp-content/themes/paris/megatheme/customizer/customizer.php on line 408
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