widget admin screen not showing

hi,

I encountered a problem that the admin widget screen not showing anymore. It shows a blank page without anything. I deactivate some plugins, the widget admin screen still can’t show.

So I cannot add new widgets, or edit or delete those already added widgets anymore. How can I fix this, or at least remove the already added widget information from database or site files? Like just clear all the widgets.

Any help will be much appreciated. Thank you.