PHP error with v9.1.0 in back-end

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Hello,
my website is on Siteground servers.
I have the same problem as here:

https://wordpress.org/support/topic/warnings-in-v9-10/

If I change PHP to v8.0.20, some of my plug-ins don’t work (Filebird and User login history), and my website is broken.

So, I must stay with PHP 7.4.30.
But, in this way, PixelYourSite gives me this error:

Warning: Use of undefined constant PYS_VERSION – assumed ‘PYS_VERSION’ (this will throw an Error in a future version of PHP) in /home/customer/www/xxx.com/public_html/wp-content/plugins/pixelyoursite/includes/functions-migrate.php on line 24

If I disable or rollback t0 .9.0.0, no error message.

Can you fix it?
Thank you!

• This topic was modified 9 minutes ago by scarpinoc.