Hello Dave. Thank you for your advice. I couldn't change the version of PHP on Plesk.
Actually I tried to install PHP7.4 before, But it was failed. Hm... It's so difficult to manage Plesk for me.:(
Hello I have faced the issues that My Plesk suddenly show this message after login
after that, I couldn't control my websites. Because no proceed to the next. Does Plesk need something setting for resolution? I can login via ssh on this Server now. If someone has solution for the issue, Please...