white page on all wordpress URLs after theme installation

Hello,

I’m having the problem described in the title…
Here is the log I get after setting the error reporting ON in my wp-config.php file :

Notice: Constant ABSPATH already defined in /etc/wordpress/wp-config.php on line 37 Notice: Constant WP_CORE_UPDATE already defined in /etc/wordpress/wp-config.php on line 38 Notice: Constant DB_NAME already defined in /etc/wordpress/wp-config.php on line 40 Notice: Constant DB_USER already defined in /etc/wordpress/wp-config.php on line 41 Notice: Constant DB_HOST already defined in /etc/wordpress/wp-config.php on line 42 Warning: Missing argument 1 for get_post(), called in /usr/share/wordpress/wp-content/themes/blackfyre/js_composer/include/classes/core/class-vc-base.php on line 444 and defined in /usr/share/wordpress/wp-includes/post.php on line 371 Fatal error: Call to undefined function wp_enqueue_media() in /usr/share/wordpress/wp-content/themes/blackfyre/functions.php on line 614

I used ftp upload in binary mode.
Thx in advance for your answer.