This domain name has already been taken. Choose another

This domain name has already been taken. Choose another

I had been trying to launch my website; new one developed in zoho sites replacing old one. in the process i got confused since the help file related to replacing sites is missing and I had deleted my domain and adding the domain again to same account but still i get this error. my email is working fine and site is pointing to zoho and shows 404; since i am going live now; kindly get this resloved asap