I am facing issues in my theme.

Hi,

I hope you guys are fine. Basically, I was facing some issues with my website https://big-shotter-fireworks.co.uk/. I share these issues with you and please resolve the issues ASAP.

Here are the issues:

1. When I open Appearance -> Widgets. It shows me these errors https://drive.google.com/file/d/19BU-Y5IiUhB9Uo7HsfoGt7psCW-sTsqs/view?usp=sharing. Please fix these errors.
2. The lost Password page is not working when i click on the My Account Button in the Menu. https://drive.google.com/file/d/1u8Lpm13G0RyS6TITUfPrfq9QyA6NpFEk/view?usp=sharing
3. On the Check Out page, there is an option to add a coupon code which is messed up. https://drive.google.com/file/d/1O0NBE78Zhe5PTOeZuodBMSKUKx5sgcig/view?usp=sharing

Also, check the theme and plugin updates, I am not doing it by myself because I am not sure whether the updation will effect the theme or not. Please do these things ASAP.

Thanks