Apex domains cannot have CNAME records.
Question and response
Question
dig klasterpro.com. NS
Answer
klasterpro.com. 5 NS ns-602.awsdns-11.net.
klasterpro.com. 5 NS ns-25.awsdns-03.com.
klasterpro.com. 5 NS ns-1229.awsdns-25.org.
klasterpro.com. 5 NS ns-613.awsdns-12.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0