I try, I can't fix Error's Cloud flare

Had you checked this article How to make Cloudflare Flexible SSL work with WordPress - Docs - InfinityFree Forum
As i saw you are using cloudflare so those errors might be caused by the wrong modification of cloudflare.
I also saw err_too_many_redirects error in your video that mean you haven’t configured ssl properly or you might be using redirect rules from cloudflare and also doing redirects from your control panel or .htaccess file.