There was an error. Cannot read properties of null (reading ‘endpoints’

I am creating a new site and starting to add [roducts and plugins etc.

I want to change some of the widgets and when i click update, i keep getting the following error ‘There was an error. Cannot read properties of null (reading ‘endpoints’

Does anyone know what this is.

I have deactivated all plugins but still no joy.

Hello,

Try to install the Classic Widgets plugin to fix this problem
https://wordpress.org/plugins/classic-widgets/

Best Regards,

[Author]

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