Gutenberg widgets area not working return error [object,object]

hi support,

I am not able to customize any widgets in sidebars. It returns an error 400 in the console.
Please see the screenshot

https://prntscr.com/wsrrp2

How I did troubleshoot

• deactivated all plugin only activated gutenberg plugin
• Activated WordPress default theme twenty twenty-one.

It still does not work. Please advise

Thank you

• This topic was modified 4 years, 2 months ago by logicdigger.