Hi
Your problem is most likely the add-on, disable them and try them

What are the last changes you made to your forum?
Do you remember?

Reinstall the same plugin and then run the file health check management page

And then the error will go to the top of the page

Now it's time to see if there is a problem with registration?

If the problem has not been resolved yet

Back up your data first

Upload a healthy version of Xenforo to your host
And xenforo upgrade method

Reinstall the xenforo installation steps and this time from the option

use I hope this method solves your problem, but be sure to back up your data