Review not showing up

In the diagnostic section of this plugin I am finding some error as to , Wc slider, wc zoom , wc lightbox. What is this error? how can I rectify it? also tell me if its disable, how to enable it?

also tell me If any person has purchased any product and has reviewed it already , then how will i know whether I should send him manually review request, because the person has already reviewed the product.Also tell me how will I know that the the request i send to the customer , whether the customer has given review or not.?