Why links render 404 error ?

What you mean — what link i used for top level item ?

i install hueman and event plugin and when i add link on menu if i want to give link anybody thay open 404 error

i add links from event plugins.

and why they work not right and when i send link anybody they open 404 error

and why wordpress post and plugin post is posting in different “timelime”

If i install «Permalink Settings» in Default they all is okey but if i install«Permalink Settings» in post name, then all is crashed and open 404 error

but no problems not resolved.

When i install egnlish lenguage all working good but when i install russian lenguage link are render 404 error, why ?