This site can’t be reached

The error messaage you copy pasted indicates a network issue. The browser cannot connect to the server.
Could be a DNS issue (domain points to the wrong IP), server is down (whole server or just apache), local or remote firewall or some routing issues could be happening where you have no controll over. For those situations it's always handy to use some online tools to see if your site is reachable from their. Like www.downforeveryoneorjustme.com for example.

For me the domain xenapedia.com resolves good and I see some general PHP warnings/errors that need to be worked out, but at least no connection issues.

I went on www.downforeveryoneorjustme.com to check my domail. Why I can not see php errors?    I have no idea what to do now...