Please help I have a CRITICAL error on my page

When I connet to my site I get " critical error"

What is this ?

I just modified some content for 2520px website and got this.

Here you find the linnk

Here is my site Read-Only: LINK
(how to share your site Read-Only link)

the www site was redirecting me to . This is your own webserver that is not configured properly.

that is weglot language autoswitch that took you to the german version. I have just desactived and the problem is still there

my hosting was fine, it happend out of the blue after making some modifications on a 2550px screen version