Page not found

Dear Author,

I just add this plugin and activate it. Nothing then. But Only home page can be access and others won’t be found.

This is my website,
http://hty.huanzhangjiang.com
Home page is fine. But click others (BLOG, FAQ, etc) from menu, Im told “404 page not found”.

I’m not able to figure out what the problem is. Any advice pls.?

Regards
Sheena

https://ww.wp.xz.cn/plugins/multisite-language-switcher/