Category URL’s 404 after setting category base to ‘.’

I want to remove /category from URLs. I have set category base to “.” I have some “category urls” which previously looked like /category/category-name/sub-category-name They are now /category-name/sub-category-name These urls previously rendered pages that would list all the posts attached to that category. They now return 404s. Where can I look to debug this?

class-wp-hook.php on line 288

Can someone help me with this error my website is not working even wp-admin page I’m getting this error message I have tried to disable all plugins but still same error? Warning: call_user_func_array() expects parameter 1 to be a valid callback, function ‘wp_pre_kses_block_attributes’ not found or invalid function name in /home//public_html/wp-includes/class-wp-hook.php on line 288 Warning:…