Challenge parking domain for mapping!

Hi, I have set up domain mapping successfully. I am now trying to map a domain to a subdomain in multisite. I have removed the domain from WHM and now trying to map the domain to a subdomain in my multisite. I log into c-panel for the multisite to park the domain and I get this error:

Park::park($RAW_FORM{‘domain’}) failed: (XID 3sctjs) You may not have more than 0 of the resource “parked domains”

Google searches turn up no matches for any part of this error.

I did have this setup exactly this way but I needed to make some changes so I deleted the multisite domain and each of the mapped domains including the domain causing this error. I have done both a graceful and forced reboot in WHM.

I would appreciate if anyone has any suggestions? thx –rick