JavaScript errors

Try & paste this below code your active theme functions.php file

add_action( 'wp_enqueue_scripts', 'load_jquery_fix', 100 );
function load_jquery_fix() {
    if ( ! is_admin() ) {
        wp_deregister_script( 'jquery' );
        wp_register_script( 'jquery', ( "//ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.min.js" ), false, '1.11.3' );
        wp_enqueue_script( 'jquery' );
    }
}