error fatal

Hello RankMath ,

Im soon finish to configure my site , after this I want to buy RankMathSEO but , when I install the plugin and put update , now its my error in the dashboard WordPress.

Warning: Constant FORCE_SSL_ADMIN already defined in /homepages/34/d873347501/htdocs/clickandbuilds/WordPress/MyCMS2/wp-config.php on line 10

Warning: Cannot modify header information – headers already sent by (output started at /homepages/34/d873347501/htdocs/clickandbuilds/WordPress/MyCMS2/wp-config.php:10) in /homepages/34/d873347501/htdocs/clickandbuilds/WordPress/MyCMS2/wp-includes/rest-api/class-wp-rest-server.php on line 1713

Warning: Cannot modify header information – headers already sent by (output started at /homepages/34/d873347501/htdocs/clickandbuilds/WordPress/MyCMS2/wp-config.php:10) in /homepages/34/d873347501/htdocs/clickandbuilds/WordPress/MyCMS2/wp-includes/rest-api/class-wp-rest-server.php on line 1713

Warning: Cannot modify header information – headers already sent by (output started at /homepages/34/d873347501/htdocs/clickandbuilds/WordPress/MyCMS2/wp-config.php:10) in /homepages/34/d873347501/htdocs/clickandbuilds/WordPress/MyCMS2/wp-includes/rest-api/class-wp-rest-server.php on line 1713

Warning: Cannot modify header information – headers already sent by (output started at /homepages/34/d873347501/htdocs/clickandbuilds/WordPress/MyCMS2/wp-config.php:10) in /homepages/34/d873347501/htdocs/clickandbuilds/WordPress/MyCMS2/wp-includes/rest-api/class-wp-rest-server.php on line 1713

Warning: Cannot modify header information – headers already sent by (output started at /homepages/34/d873347501/htdocs/clickandbuilds/WordPress/MyCMS2/wp-config.php:10) in /homepages/34/d873347501/htdocs/clickandbuilds/WordPress/MyCMS2/wp-includes/rest-api/class-wp-rest-server.php on line 1713

Warning: Cannot modify header information – headers already sent by (output started at /homepages/34/d873347501/htdocs/clickandbuilds/WordPress/MyCMS2/wp-config.php:10) in /homepages/34/d873347501/htdocs/clickandbuilds/WordPress/MyCMS2/wp-includes/rest-api/class-wp-rest-server.php on line 1713

Warning: Cannot modify header information – headers already sent by (output started at /homepages/34/d873347501/htdocs/clickandbuilds/WordPress/MyCMS2/wp-config.php:10) in /homepages/34/d873347501/htdocs/clickandbuilds/WordPress/MyCMS2/wp-includes/rest-api/class-wp-rest-server.php on line 1713

Warning: Cannot modify header information – headers already sent by (output started at /homepages/34/d873347501/htdocs/clickandbuilds/WordPress/MyCMS2/wp-config.php:10) in /homepages/34/d873347501/htdocs/clickandbuilds/WordPress/MyCMS2/wp-includes/rest-api/class-wp-rest-server.php on line 1713

Warning: Cannot modify header information – headers already sent by (output started at /homepages/34/d873347501/htdocs/clickandbuilds/WordPress/MyCMS2/wp-config.php:10) in /homepages/34/d873347501/htdocs/clickandbuilds/WordPress/MyCMS2/wp-includes/rest-api/class-wp-rest-server.php on line 1737

Warning: Cannot modify header information – headers already sent by (output started at /homepages/34/d873347501/htdocs/clickandbuilds/WordPress/MyCMS2/wp-config.php:10) in /homepages/34/d873347501/htdocs/clickandbuilds/WordPress/MyCMS2/wp-includes/rest-api/class-wp-rest-server.php on line 1713

Warning: Cannot modify header information – headers already sent by (output started at /homepages/34/d873347501/htdocs/clickandbuilds/WordPress/MyCMS2/wp-config.php:10) in /homepages/34/d873347501/htdocs/clickandbuilds/WordPress/MyCMS2/wp-includes/rest-api/class-wp-rest-server.php on line 1713

I don’t know so much what its meaning.

Thank you for your help.