Why I can't see these js errors in console

Why I can't see these js errors in console

Reviewer says that there are these 2 errors in my wordpress theme. But I
don't know why I can't see these errors in my browser consoles.
I've also added define('WP_DEBUG', true); define('SCRIPT_DEBUG', true); in
wp-config.php.
These are the errors that I can't see in my console.
Uncaught SyntaxError: Unexpected token < jquery.flexslider-min.js:4
Uncaught TypeError: Object [object Object] has no method 'flexslider'
main.js?ver=3.6:19