Fatal error: Uncaught Error: Class 'WP_Block_Styles_Registry'

I am having some issues determining the solution to this problem below. The website was sent to our team to fix.

Turned on error reporting in wp-config.php:
define('WP_DEBUG', true);

WordPress version: 5.3.2
PHP version: 7.2

WordPress Theme: Grow Pro

Fatal error: Uncaught Error: Class 'WP_Block_Styles_Registry' not 
found in /home/website/public_html/clientsite.com/wp-includes/script- 
loader.php:2902 Stack trace: #0 
/home/website/public_html/clientsite.com/wp-includes/class-wp- 
hook.php(288): enqueue_block_styles_assets('') #1 
/home/website/public_html/clientsite.com/wp-includes/class-wp- 
hook.php(312): WP_Hook-apply_filters(NULL, Array) #2 
/home/website/public_html/clientsite.com/wp-includes/plugin.php(478): 
WP_Hook-do_action(Array) #3 
/home/website/public_html/clientsite.com/wp-includes/script- 
loader.php(2856): do_action('enqueue_block_a...') #4 
/home/website/public_html/clientsite.com/wp-includes/class-wp- 
hook.php(288): wp_common_block_scripts_and_styles('') #5 
/home/website/public_html/clientsite.com/wp-includes/class-wp- 
hook.php(312): WP_Hook-apply_filters(NULL, Array) #6 
/home/website/public_html/clientsite.com/wp-includes/plugin.php(478): 
WP_Hook-do_action(Array) #7 /home/website/public_html/ir in 
/home/website/public_html/clientsite.com/wp-includes/script-loader.php 
on line 2902

There has been a critical error on your website.

Learn more about debugging in WordPress.

For privacy reasons, I wouldn't be sharing the live website link.

Any help with resolving these errors would be greatly appreciated.

Thank you in advance,
Nick Hiebert