Apex domains cannot have CNAME records.
Question and response
Question
dig erpropertymanagement.com. NS
Answer
erpropertymanagement.com. 5 NS ns1.dyna-ns.net.
erpropertymanagement.com. 5 NS ns2.dyna-ns.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0