problem with webmastertools (search console)

Hi,

You can ask Google to remove the indexed page(s) relating to your deleted plugin permanently, since it is already returning 404 … https://support.google.com/webmasters/answer/1663419?hl=en

To fix duplicate titles, you just need to make sure that your title tags are not always showing just your website or blog name, for example.

One way to fix this is by using a plugin like Yoast SEO, which can help make title tags of every page on your website unique.

AFAIK WordPress renders unique title tags, so your theme or another plugin could be causing the duplicate title problem. See for more info … https://make.www.ads-software.com/core/2014/10/29/title-tags-in-4-1/

Hope these help!