Widgets in the WordPress dashboard are not loading for long after updating the WordPress

Question

Screenshot images click to open.

Today, I updated my WordPress website, and when I go to my Widget area, it keeps loading for a long time and throws an error. Screenshot attached. Sometimes there are many red lines showing. Also, the designs of widgets changed.

I cleared the cache, but no luck. I just want the old-style widgets that are super easy.

Answer 1

I reckon I have found one solution. I installed a plugin called WP Classic Widgets. It will generate the older-style widgets, with apparently no errors on the website. I am not sure for how long this plugin will work, but for a temporary solution, it works well.