I try lot of times to verify DKIM

can you help me, the selector name is zoho._domainkey.sw-design.co

I tried to check with  http://dkimcore.org/ and it says 

This is not a good DKIM key record. You should fix the errors shown in red.

DNS query failed for 'zoho._domainkey.sw-design.co':NOERROR

A public-key (p=) is required

Please help, thank you