thank you for the answer but I think for plugins too but already I deactivate all of the plugins but still have a problem even I change the theme to 2020 still the same!As is clear in the screenshot, it's the corona plug-in causing the problem. But I think you've found out already, and de-activated or removed the plug-in.
As is clear in the screenshot, it's the corona plug-in causing the problem. But I think you've found out already, and de-activated or removed the plug-in.