Warning when trying to create a new site

I am getting a warning message when trying to create a new site from the network side.

Warning: preg_match() expects parameter 2 to be string, object given in /home/ecyp/public_html/wp-includes/formatting.php on line 3435

Warning: preg_match() expects parameter 2 to be string, object given in /home/ecyp/public_html/wp-includes/formatting.php on line 3424

Warning: preg_match() expects parameter 2 to be string, object given in /home/ecyp/public_html/wp-includes/formatting.php on line 3435

Warning: strip_tags() expects parameter 1 to be string, object given in /home/ecyp/public_html/wp-includes/formatting.php on line 3407

Warning: strip_tags() expects parameter 1 to be string, object given in /home/ecyp/public_html/wp-includes/formatting.php on line 3407

Catchable fatal error: Object of class WP_Error could not be converted to string in /home/ecyp/public_html/wp-includes/kses.php on line 1038