Failed to lookup registrar and hosting error

Hello, I have not been able to add my website to Cloudflare, I have been trying to do it but it always sends me this error ; domain: sminka.ba
Failed to lookup registrar and hosting information of sminka.ba at this time. Please contact Cloudflare Support or try again later.

Please use the search, as suggested and required per forum rules. That topic has been discussed way too often.