How to avoid Crawl errors

Hi BHWer
I have a website, with Wordpress CMS. I don't understand why when Google crawl my site and have 4 "Not found" errors. You can see screenshot below.


That urls I was posted it before and trash it, but google still crawl and give Not found errors.
Please tell me how to avoid this, because i think if have not found errors while crawl, that will effect to SEO result.
Thank you very much.

please help

oh, where are BHWer? can you hear me?

This is the forum suggestions and feedback area; not the most proper area to post this!