DKIM Verification failled (BigRock)

DKIM Verification failled (BigRock)

I'm having a problem, get the following error using the 3rd party tool ( http://dkimcore.org/c/keycheck)

DNS query failed for 'zoho._domainkey.comemierderia.com':NXDOMAIN

A public-key (p=) is required

Please advise