HELP! Projects pages (and employee, clients, testimonials) no longer showing up

My projects are still showing up in the front page widget (as well as employee, testimonials widgets) but when you drill down to the individual page for each project the content is “Page Not Found” instead of the information about each project. This was not the case until today.

Any ideas as to what would fix this problem? The content is there in the admin panel, the page is just not showing anymore…

See URL below link and click on any project to “Learn More”:
http://69.89.31.90/~helpdeu8/our-work/

Found the solution in an older forum post:

September 29, 2016 at 2:31 pm #600656

Kharis Sulistiyono

Moderator
Dear Mike,

Try to flush your site’s permalink by doing the following:

From dashboard > Settings > Permalinks > just hit the Save Changes button. If the issue remains, please check the .htaccess file in the root folder of your WordPress install. It might not be created automatically due to folder permissions issue. Please see the WordPress codex.

Regards,
Kharis