Help!!Since upload Robots.txt to my website,GA said website has Serious Problem

Since I upload Robots.txt to my website,GA said my website has Serious problems.
In November I refocused website, also used a new webhost. and the urls in the robots.txt are 404 pages.
And now what should I do?
My website is : https://www.mul-tech.com
below is my robots.txt
User-agent: *
Disallow: /wp-admin/
Disallow: /wp-includes/
Disallow: /wp-content/plugins/
Disallow: /culture.html
Disallow: /oldindex.html
Disallow: /doubleside.html
Disallow: /singleside.html
Disallow: /multilayer.html
Disallow: /cn/home.html
Disallow: /heavecopper_pcb.html
Disallow: /cn/
Disallow: /aluminum_pcb.html
Disallow: /impendance_control_pcb.html
Disallow: /news.html
Disallow: /product_heavy_copper.html
Disallow: /product.html
Disallow: /aboutmultech.html
Disallow: /quality.html
Disallow: /factorycn.html
Disallow: /capabilitycn.html
Disallow: /contactuscn.html
Disallow: /qualitycn.html
Disallow: /newscn.html
Disallow: /contact.aspx
Disallow: /doublside_pcb.html
Disallow: /index.aspx
Disallow: /links.aspx
Disallow: /map.aspx
Disallow: /Notices.aspx
Disallow: /cn/about.html
Disallow: /product_impendance.html
Disallow: /quality2.html
Disallow: /rogers_pcb.html
Disallow: /capability2.html
Disallow: /cn/jg.html
Disallow: /category/uncategorized/
Disallow: /hello-world/
Disallow: /iso.html
Disallow: /cn/from.asp
Disallow: /keepwhite.html
Disallow: /FR-4_TG170.html
Disallow: /about-multech/www.mul-tech.com/contact-us
Disallow: /about-multech/www.mul-tech.com