Apex domains cannot have CNAME records.
Question and response
Question
dig asociacionmarvioleta.org. NS
Answer
asociacionmarvioleta.org. 5 NS ns-1105.awsdns-10.org.
asociacionmarvioleta.org. 5 NS ns-1641.awsdns-13.co.uk.
asociacionmarvioleta.org. 5 NS ns-70.awsdns-08.com.
asociacionmarvioleta.org. 5 NS ns-1251.awsdns-28.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0