PHP Warning: Constant WP_CONTENT_URL already defined

You’ve got that constant defined in two places. The error message tells you where it is first defined:

     Warning: Constant WP_CONTENT_URL 
already defined in 
/var/www/html/my-website/wp-config.php on line 11

Look at line 11 of the wp-config.php file. I’d bet that you’ll find that constant defined there.

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