Getting error only on the Tools Page In admin area

Hi, my site seems to be working okay, I will do extensive testing later. But for now I have an error on Tools > Host Tools Page.

The error is: Something went wrong! Please try reloading the page.

I have checked my php and everything seems to be working okay. Any ideas what it could be?
Many thanks.

Hello hawk007!

Do you have any recent messages in the error log of your server?

 Sorry for the delay. Yes , the error (I just discovered) is due to MySQL 8 (my new server) deprecating the cache_queery_limit. Previous install was mysql 5.7 (or close to that so was working. Thanks anyway Leonid