Lay Theme Forum

I am very sorry to ask again for another website of mine.
I used to build my personal website with Elementor, then changed the design to lay theme, build a website in Local, moved it via the migration plugin to my website www.corneliabuchheim.com
Often the site doesn't load. When I log in my wp dashboard, the site is loading correct. But in my dashboard I have several error warnings. Can you help me again?
This time I checked the debug mode, it is turned off.

@arminunruh thanks, that helps a lot!
Do you know why it started the debug mode? I never changed something in the FTP.

Hello,
I have problems with the site www.rene-weisbrich.com
It shows always the error lines (see screenshot) and I can't login in wp-admin.
e.g.
Notice: Function _load_textdomain_just_in_time was called incorrectly. Translation loading for the wpforms-lite domain was triggered too early. This is usually an indicator for some code in the plugin or theme running too early. Translations should be loaded at the init action or later. Please see Debugging in WordPress for more information. (This message was added in version 6.7.0.) in /home/www/wordpress2/wp-includes/functions.php on line 6121

Maybe someone can explain what is the problem? Or have a solution?
I would be very glad!
Many thanks in advance
*Cornelia

Thanks a lot for the answer.
I am not familiar with coding and I am very slow, please excuse me.
First I asked my hoster and he turned off the updraftplus-Plugin, so the website is working again.
Now I tried to follow your steps. But I can't find the line 'function lay_load_textdomains' in the functions.php file. My index: /home/www/wordpress/wp-content/themes/lay/functions.php
My functions.php file has a lot of lines starting with 'require' and this:

I have a similar problem with the website www.rene-weisbrich.com
I also use updraftPlus for Backups.
But beside that I can't login in wp-admin anymore. Although I turned off the Tracking protection.
Here in firefox (where the website is in disorder):

In edge the website is at least in order: