Warning: Use of undefined constant SECURE_AUTH_COOKIE

  • Warning: Use of undefined constant SECURE_AUTH_COOKIE – assumed ‘SECURE_AUTH_COOKIE’ (this will throw an Error in a future version of PHP) in /var/www/wordpress/wp-includes/pluggable.php on line 766

    Warning: session_start(): Cannot start session when headers already sent in /var/www/vendor/politsturm/wordpress-theme/admin/check_more.php on line 8
    You do not have sufficient permissions to access this admin page.

    When adding and activating a plugin, Ghost immediately kicks me out of the admin panel and throws this error.

    When the plugin is removed via ftp, the error disappears.

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