jQuery is not defined – some theme features do not work!

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I had a similar problem after updating WordPress, try adding this in functions.php :

function load_jquery() 
{ 
    wp_register_script('mainJquery', get_template_directory_uri() . '/assets/js/jQuery.js', array('jquery'), 1, true);
    wp_enqueue_script('mainJquery'); 
}
add_action('wp_enqueue_scripts', 'load_jquery');

I was only missing array(‘jquery’), maybe it’s the same for you…