how to fix 304 - not modified error with wordpress?

admin

Administrator
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I just freshly installed wordpress 4.8 and accessPress Parallax for theme (<a href="http://demo.accesspressthemes.com/accesspress-parallax/" rel="nofollow noreferrer">http://demo.accesspressthemes.com/accesspress-parallax/</a>).

Now I see that, there's no parallax effect and responsive menu not working on mobile view. I suspect this has something to do with js files not loaded?

I checked the network tab and found many js files returning 304 error.
<a href=" " rel="nofollow noreferrer"><img src=" " alt="enter image description here"></a>

What does the 304 means here? How can I fix this? Currently I'm running on localhost.