Error: Redirecting to 404 page.

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Joined: Nov 2017

I can't able to access my Webservice on my site that is running with Prestashop 1.7 version. So I can't able to connect to a button on my menu module Prestashop.
This is my module I installed: Mega Menu PRO
When I access it is redirecting to 404 page.
Can someone help me?