function ‘enqueue_block_styles_assets’ not found or invalid function name in /home/tk1u4k4kw9t4/public_html/wp-includes/class-wp-hook.php on line287

Below mentioned PHP error is blocking me from adding new post on my wordpress website. Kindly assist.

PHP Warning: call_user_func_array() expects parameter 1 to be a valid callback, function ‘enqueue_block_styles_assets’ not found or invalid function name in /home/tk1u4k4kw9t4/public_html/wp-includes/class-wp-hook.php on line 287