Serialization of 'Closure' is not allowed on my profile link

I create a new menu linked to an article, and it shows "Serialization of 'Closure' is not allowed".
link is here: http://cefgasi.com/profile.html

I can't access your site now, kindly check.

pls use this cefgasi.com without the https or http.

If your host limits access from my place, pls add exception for this IP: 222.252.16.54

Hello pls, the http has been resolved, can you please check my issue for me now. Yhe serialisation issue

I still can't access your site, pls check again.

Pls it is resolved finally. You can now work on it pls.

Unfortunately, I still can't access your site, the error is the same as the screenshot I sent in above reply.

Are you using any extension for firewall? You can temporarily disable it so I can resolve this issue for you first and enable it later.