Upgrade

I believe since I upgraded WordPress the plugin is not working. I get the following errors.

Warning: preg_match() expects parameter 2 to be string, array given in /home/customer/www/myrvresource.com/public_html/wp-includes/class-wp-block-parser.php on line 417

Warning: strlen() expects parameter 1 to be string, array given in /home/customer/www/myrvresource.com/public_html/wp-includes/class-wp-block-parser.php on line 489

Warning: Cannot modify header information – headers already sent by (output started at /home/customer/www/myrvresource.com/public_html/wp-includes/class-wp-block-parser.php:417) in /home/customer/www/myrvresource.com/public_html/wp-content/plugins/sg-cachepress/core/Supercacher/Supercacher_Helper.php on line 68