i want to fix error: JUser: :_load: Unable to load user with ID: 722 and remove cookies when start page

Dear hoanglm

1. Because we used the user ID 722 to create sample data. You can create new user and change ID to 558 in your database and ID in user group table
your YOUR PREFIX_users table and group user table

2. please refer docs.joomla.org/Disable_all_cookies_for_normal_visitors_in_Joomla

thanks