Apex domains cannot have CNAME records.
Question and response
Question
dig blacknightsolutions.com. NS
Answer
blacknightsolutions.com. 5 NS ns2.blacknightsolutions.com.
blacknightsolutions.com. 5 NS ns.blacknightsolutions.com.
Authority
The response has no authority records.
Additional
ns.blacknightsolutions.com. 5 A 81.17.240.204
ns2.blacknightsolutions.com. 5 A 78.153.202.4
ns.blacknightsolutions.com. 5 AAAA 2a01:a8:dc1:33:0:0:0:33
ns2.blacknightsolutions.com. 5 AAAA 2a01:a8:dc2:33:0:0:0:33
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0