web display 404 page when I finished edit page and update.

hi there:

I use BE theme as my company website.
I edit some text in wordpress backend and click update button when I finished it. However, the system display error informaiton as below.
It is urgent. Could you please help me to fix it? 
Thank you.



Ooops... Error 404

We are sorry, but the page you are looking for does not exist.

Please check entered address and try again or go to homepage


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