I also tried deleting all the plugins and reinstalling them, as well as the theme, but the same thing happens. When I activate Composer, the page disappears, and when I activate it together with the Claud library, the following message appears:
“There has been a critical error on this website.
Learn more about troubleshooting WordPress.”
I look forward to a possible solution. Thank you.

I ran another test and uninstalled the theme plugins and installed them one by one. It seems that the ones causing the conflict are:
tagDiv Composer and tagDiv Cloud Library.
When I activate tagDiv Composer, the page disappears, and when I activate tagDiv Cloud Library, the error appears. However, if I activate only tagDiv Cloud Library, the page is visible, but obviously it says that tagDiv Composer needs to be activated for it to work… I don’t know what other tests to do, and what worries me most is that I have several licenses for this same theme and I don’t want them to start failing.

Hi,
Yes, I had already tried deactivating all the plugins and leaving only the theme plugins, and the problem persists. I deleted the plugins and reinstalled them, and the problem reappeared. Right now, I have all the plugins deactivated and the site is working, but when I reinstall tagDiv Cloud Library, the critical error reappears.
Yesterday I sent an email with access to my site because I don’t know how to fix it.