Apex domains cannot have CNAME records.
Question and response
Question
dig aishana.org. NS
Answer
aishana.org. 5 NS ns-259.awsdns-32.com.
aishana.org. 5 NS ns-299.awsdns-37.com.
aishana.org. 5 NS ns-594.awsdns-10.net.
aishana.org. 5 NS ns-1853.awsdns-39.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0