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You can see on the Home page that the “Mountain” project is already there

Already where? I can’t see any such link on your home page.

View post on imgur.com

try to click on the “Mountain” text

I found out what was the problem

I forgot to create the project page

Hello I have the same problem, created a “project” page and still wont work, how did you do it?

I’m sorry but as you are using a commercial theme, you need to seek support from the theme’s developer/vendor. We do not support commercial products here.
Try https://www.elegantthemes.com/forum/