Urgent: Web pages published but no longer live

Hello,

Most of my web pages are not appearing.
It says ‘404 – Page not found’ for most of the pages, both in the header and the footer.
The only pages currently visible are the home page and energy highlights.

Please any help to solve this problem?
The pages have been published and live for over 2 years now.

Thanks!
Kuniquesol

The page I need help with: [log in to see the link]



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