widget area is full of errors

I just bought your woodmart theme and today went to widget area to see what it has and i found this is showing me a lot of errors. What errors are these ? i did not do anything so far. Can you fix these asap? please see the attached image

Thanks

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Hello,

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

Best Regards

[Author]

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