'New Article' button leads to 404 error

http://futurecellar.com/members-grid/

I just installed social articles in my website
the show articles function works perfect, but when i click new article, it leads to a 404 page, just couldn’t redirect to articles/new page.

i disabled the ‘user submitted post’plugin , but still nothing

any idea? thanks a lot

https://ww.wp.xz.cn/plugins/social-articles/